Smoking weed while trying to conceive (female): what the evidence says, plus sleep and lifestyle
Many women ask about smoking weed while trying to conceive (female use, specifically), and the reassuring news is that one large North American study found similar chances of getting pregnant over 12 cycles whether or not women used marijuana (called cannabis in the UK). That finding is limited rather than proof of safety, so across the reproductive years many women find it helps to talk it through with their doctor.
If you're asking this question, you're already doing the thoughtful thing, and it's a common one to ask. Weed rarely sits on its own: for many women it's tied up with winding down, sleeping and coping with stress, which are the habits this stage's guidance speaks to most clearly. So this page looks at cannabis first, then at the sleep and lifestyle targets that support your cycles, your fertility and your long-term health, whether a baby is planned for this year or not at all.
Does smoking weed while trying to conceive affect female fertility?
The evidence so far is reassuring on one point: it shows no clear link between female marijuana use and time to pregnancy. It rests on one observational study in which women reported their own use. About 12% of the women in it reported use in the 2 months before they enrolled, so if this is you, you are far from alone. A study like this shows a pattern across thousands of women, not what will happen in any one woman's cycles, so it reads best as reassurance with limits rather than an all-clear.
Guidance does change once a pregnancy begins. ACOG's 2025 clinical consensus says there are no medical indications for cannabis during pregnancy and postpartum, and the CDC advises against it in pregnancy and suggests talking to a doctor when you're planning one. In the UK, the NHS says illegal drugs, including cannabis, could have a serious effect on an unborn baby. That is a good reason to have the conversation with your doctor early and calmly.
Age is a separate part of the picture. If it is part of your planning too, our page on fertility by age sits with the health checks for this stage, including when a longer wait is worth raising.
Area, target, practical steps
| Area | Target | Practical steps |
|---|---|---|
| Sleep | 7 to 9 hours a night at consistent times. | A dark, cool room, no caffeine after midday and a wind-down routine. Sleep may dip before your period. |
| Stress | A daily recovery habit. | Outdoor walks, slow breathing or time with friends. Chronic stress can disrupt cycles. |
| Contraception | A method that fits your plans, reviewed as your needs change. | Coil, implant and other methods are options to compare with your doctor. |
| Sexual health | Regular testing with new partners. | Condoms protect against STIs. Sexual health clinics offer free testing. |
| Fertility planning | Know when to ask for help. | The timeframe is listed under when to see a doctor. If egg freezing is on your mind, it is most effective before 35. |
| Smoking and vaping | A conversation with your doctor that covers tobacco, vaping and cannabis smoking together. | A preconception visit is a good place to talk through options for cutting down. |
| Alcohol | Less is better; none in pregnancy. | US and UK limits differ; both are set out in the section on other lifestyle habits. |
| Sun and skin | Broad-spectrum SPF 30+ and no tanning beds. | A small daily habit that sits alongside the rest of this list. |
| Breast awareness | Know what's normal for you. | Lumps, skin changes or nipple changes are worth showing a doctor. |
What can help you sleep if you're cutting back on weed?
Many women find a steady routine is a good place to start: 7 to 9 hours a night at consistent times, a dark, cool room, no caffeine after midday and a gentle wind-down. Sleep may dip before your period, so a few restless nights then are common rather than a sign that something is failing. Our page on menstrual cycle phases explains where in the month that tends to fall.
If weed has been part of how you wind down, one gentle option is a daily recovery habit in that same evening slot, such as an outdoor walk, slow breathing or time with friends. Chronic stress can disrupt cycles, so a habit like this supports more than your sleep. For the years before this one, there is our guide to teenage sleep, and for the years after it, perimenopause sleep.
If you notice mood shifts around your period, our page on PMDD is a place to read on. And if poor sleep carries on most nights whatever you try, insomnia has its own page, and it's worth raising with your doctor.
Which other lifestyle habits matter most when you're planning a pregnancy?
Alcohol is the habit where guidance differs most by country. US guidance (the Dietary Guidelines for Americans, 2025–2030) no longer sets a daily limit, while the UK low-risk limit is 14 units, about 8 US drinks, a week (UK Chief Medical Officers, 2016). In both countries less is better, and none is advised in pregnancy, so any cutting back counts.
If pregnancy is a plan for later rather than now, contraception is worth reviewing as your needs change. The treatments page on perimenopause contraception sets out the methods and is written for the years after this one.
Facts
Common questions
Is occasional weed use different from regular use when trying to conceive?
Nobody can say reliably yet. The researchers found it hard to classify how much women used and suggested day-specific records in future work, so there is no trusted figure for a low dose, or for edibles compared with smoking. Many women find it useful to note roughly how often and in what form they use, to share at a preconception visit.
Should I stop weed during the two-week wait?
The research here doesn't separate the two weeks after ovulation, so there is no figure for that window. The CDC suggests talking to a doctor when you are planning a pregnancy, which is the step that fits this question best. Many women find it easier to settle timing with their OB-GYN (GP in the UK) before a cycle starts than partway through it.
Will my doctor test me for cannabis if I mention it?
ACOG's 2025 clinical consensus recommends that cannabis screening before pregnancy, during pregnancy and after birth is done by asking, through an interview or a self-report form, with no urine or hair testing used as a screen. The question is meant for everyone, so being asked is routine and not a sign you have been singled out.
Does my partner's weed use matter?
In the same study, about 14% of male partners reported marijuana use in the 2 months before enrolling, and couples' chances of conceiving were similar either way. It's worth both of you mentioning use at a preconception visit (a pre-conception appointment in the UK) so the advice fits you as a couple.
What about weed while breastfeeding later on?
THC is stored in body fat and released slowly, so a baby can be exposed through breastmilk even after use has stopped. The CDC advises against all cannabis while breastfeeding. ACOG discourages use too, but says continued use is not a reason to discourage breastfeeding itself, which is a helpful distinction if stopping takes time.
Where can I get help cutting down?
In the US, your OB-GYN or primary care doctor is a good place to start. In the UK, the NHS points to your GP, a midwife or the FRANK helpline on 0300 123 6600. Asking early gives you more time to find what works, and many women find a doctor's visit about this is confidential and unhurried.
Next steps
A good place to start is one honest conversation: mention your cannabis use at your next visit with your OB-GYN (or GP in the UK), and ask what timing makes sense for your plans. From there, you might pick one row from the table to work on this month, perhaps a steadier bedtime or an evening walk in place of the usual wind-down. What fits you is yours to decide, because this is not one size fits all.
See a doctor promptly if you have
- Not pregnant after 12 months of trying (6 months if 35 or over)
- Lumps, skin changes or nipple changes
- Pelvic pain or irregular cycles that persist: ask for a referral
- Low mood, anxiety or intrusive thoughts in pregnancy or after birth
Also in the reproductive years
The same topic in the stage before and after
Sources
The guidelines and studies this page draws on.
- Marijuana Use Does Not Lower Chances of Getting Pregnant (summary of Wise et al., J Epidemiol Community Health), Boston University School of Public Health (2018)
- Wise et al., Changes in behaviors over time among couples trying to conceive (PRESTO), Epidemiology / PubMed Central (2020)
- Cannabis Use During Pregnancy and Lactation, ACOG Clinical Consensus No. 10 (2025), as reported by Contemporary OB/GYN, Contemporary OB/GYN, reporting ACOG (2025)
- Marijuana and Pregnancy, CDC (undated)
- Illegal drugs in pregnancy, NHS (undated)
- NICE CG156: Fertility problems, NICE (2013)
- Dietary Guidelines for Americans, 2025–2030, US Department of Agriculture and US Department of Health and Human Services (2025)
- UK Chief Medical Officers' low-risk drinking guidelines, UK Chief Medical Officers (2016)