Yes, it's possible, though there's no precise probability for any single instance. Research on whether pre-ejaculatory fluid contains sperm is genuinely mixed — one widely cited study found sperm in samples from about 4 in 10 men, while a smaller, more recent pilot study found little to none under stricter test conditions.
Pre-ejaculate, commonly called precum, is a small amount of fluid released from the penis during arousal, before ejaculation. It's produced mainly by the Cowper's (bulbourethral) glands and generally serves to lubricate and neutralise the urethra. On its own, this fluid is not the same substance as semen, which is what carries sperm from the testes.
This is where the research gets genuinely mixed, and it's worth being upfront about that rather than picking one number and presenting it as settled fact.
A frequently cited study (Killick et al., published in Human Fertility, 2011) collected pre-ejaculatory fluid samples from a small group of men and found that about 4 in 10 of the men tested (41%) produced at least one sample containing spermatozoa, and roughly a third of those had samples with motile (actively moving) sperm. Interestingly, sperm tended to be either present in all of a given man's samples or none of them — suggesting individual variation rather than a consistent, universal rule.
More recently, a smaller pilot study published in the journal Contraception (2024) examined pre-ejaculate specifically under conditions designed to reflect technically correct, "perfect-use" withdrawal, and found sperm content to be low to essentially absent. This suggests some sperm detected in earlier studies may, in some cases, reflect residue from a prior ejaculation rather than being a fixed feature of pre-ejaculatory fluid itself — though this is a small, preliminary pilot study, not a large-scale confirmation.
There's no published statistic that isolates "chance of pregnancy from precum alone" as its own number — that specific scenario hasn't been studied in isolation from withdrawal as a contraceptive method overall. What is measured is the effectiveness of withdrawal (the pull-out method) as a whole.
Planned Parenthood lists withdrawal as about 78% effective with typical use — meaning roughly 22% of couples who rely on it alone experience an unintended pregnancy within a year. The Guttmacher Institute places withdrawal in a broader category (alongside the sponge, diaphragm and spermicides) with typical-use failure rates ranging from 14% to 27% and perfect-use failure rates from 4% to 20% a year.
Sperm present in pre-ejaculate is one plausible contributor to why even careful withdrawal isn't 100% effective — but inconsistent timing, not pulling out in time, and simple human error are almost certainly larger factors in the real-world (typical-use) failure rate.
If you're pregnant and want to estimate when conception likely happened, our calculator can help.
Open the Conception Calculator →If reliably avoiding pregnancy is the goal, withdrawal alone is one of the less effective methods available, and combining it with a second method (such as condoms) meaningfully reduces the risk of both pregnancy and STIs compared with withdrawal on its own. If you've had unprotected sex, including a withdrawal "slip," and want to reduce pregnancy risk after the fact, emergency contraception is available and is most effective the sooner it's used. For method comparisons and what best suits your situation, a pharmacist or GP can talk you through the options.
Can you get pregnant from precum?
Yes, it's possible, though it isn't guaranteed and no precise per-instance probability exists. One widely cited study found spermatozoa in pre-ejaculatory fluid samples from about 4 in 10 men tested, and about a third of those men had samples with motile (moving) sperm. Whether any individual instance of precum contains enough sperm to cause pregnancy varies and generally can't be predicted.
What are the chances of getting pregnant from precum specifically?
There's no established statistic that isolates precum alone from the withdrawal method as a whole. What is measured is overall withdrawal-method effectiveness: commonly cited estimates put typical-use effectiveness at around 78%, meaning roughly 22% of couples relying on withdrawal for a year experience an unintended pregnancy. Sperm present in pre-ejaculate is one plausible contributor to this failure rate, alongside imperfect timing and inconsistent use.
Does precum always have sperm in it?
No. Research suggests pre-ejaculatory fluid itself is not produced by the testes and doesn't inherently contain sperm, but sperm can be present, likely picked up from the urethra, sometimes left over from a previous ejaculation. Studies vary in how often they detect sperm, from a substantial minority of samples in older research to very low or negligible amounts in a smaller, more recent pilot study using stricter conditions.
How effective is the pull out method (withdrawal)?
Planned Parenthood lists withdrawal as about 78% effective with typical use, meaning around 22% of couples relying on it alone experience a pregnancy within a year. With perfect, consistent technique it's considerably more effective, but perfect use is difficult to sustain every single time, which is why typical-use figures are much higher than perfect-use figures.