Smelly discharge during pregnancy is usually caused by an infection that needs treatment from your healthcare provider, not something you can resolve with hygiene changes alone. Normal pregnancy discharge is thin, white or pale yellow, and has only a mild odor. If yours smells noticeably fishy, foul, or different from what you’re used to, that’s a signal something has shifted in your vaginal environment and likely needs medical attention.
What Normal Pregnancy Discharge Looks Like
Pregnancy increases blood flow to the pelvic area and raises estrogen levels, which together produce more vaginal discharge than you’re used to. This is called leukorrhea, and it’s completely normal. It’s typically white, milky, or pale yellow, with a thin or slightly mucous-like consistency that may increase as your pregnancy progresses. Healthy vaginas do have a mild odor, and that’s not a problem.
The key distinction is between “mild” and “strong.” A faint smell is expected. A persistent fishy, sour, or foul odor, especially paired with a change in color or texture, points to something else going on.
The Most Common Cause: Bacterial Vaginosis
Bacterial vaginosis (BV) is the most frequent reason for smelly discharge during pregnancy. It happens when the balance of bacteria in the vagina shifts, allowing certain types to overgrow. The hallmark symptom is a strong, fishy odor that often becomes more noticeable after sex. The discharge itself may look grayish-white and thin.
BV matters during pregnancy because it has been associated with adverse outcomes including premature rupture of membranes, preterm birth, and postpartum uterine infections. The relationship between BV and preterm delivery isn’t fully understood, as the U.S. Preventive Services Task Force notes it remains unclear whether BV directly causes preterm birth. Still, the CDC recommends treatment for all symptomatic pregnant women precisely because of these associations.
Treatment is straightforward. Pregnant women can be treated with the same antibiotic regimens used for non-pregnant women, typically a course of oral or vaginal antibiotics taken for five to seven days. These medications have been studied in pregnant populations and are considered safe. Your provider will take a vaginal swab to confirm BV before prescribing anything.
Yeast Infections and Other Causes
Yeast infections affect roughly 10% of pregnant women and can produce a thick, white, cottage cheese-like discharge. The smell is usually more yeasty or bread-like than fishy, and itching, burning, and redness around the vulva are the more prominent symptoms.
The important thing to know about yeast infections during pregnancy is that topical antifungal creams are the recommended first-line treatment. Oral antifungal pills carry real risks: research has found that a single oral dose during early pregnancy was associated with more than double the risk of miscarriage, and higher doses during the first trimester were linked to an increased risk of heart defects in newborns. Stick with the topical creams your provider recommends.
Trichomoniasis, a sexually transmitted infection, is another possible cause. It produces a thin discharge that can be clear, yellowish, or greenish with a fishy smell. It requires a different antibiotic than BV, so getting a proper diagnosis matters rather than guessing at the cause.
How to Tell Discharge From Leaking Fluid
One concern worth addressing: sometimes what seems like unusual discharge is actually leaking amniotic fluid. Amniotic fluid is mostly clear or pale straw-colored, and it should be odorless. If it has a foul smell, that could indicate an infection. Unlike discharge, amniotic fluid tends to leak in a trickle or gush that you can’t control the way you might control urine. If you’re unsure whether you’re seeing discharge, urine, or amniotic fluid, check for smell and color. Urine has its own distinct odor, while amniotic fluid is typically odorless and watery. Any sudden, uncontrollable leaking warrants a call to your provider right away.
What You Can Do at Home
Home measures won’t cure an infection, but they can support vaginal health and keep you comfortable while you wait for treatment to work or while managing normal pregnancy discharge.
- Skip the douche entirely. The American College of Obstetricians and Gynecologists is clear on this: do not douche during pregnancy. Douching disrupts the natural bacterial balance and can push infections further into the reproductive tract.
- Use only plain water on the vulva. No soaps, body washes, or scented products. ACOG specifically advises against using any soap on the vulva, even “gentle” or “pH-balanced” varieties.
- Wear breathable cotton underwear and change it when it gets damp. Moisture creates a friendlier environment for bacterial and yeast overgrowth.
- Avoid scented pads, liners, and sprays. These mask odor temporarily but can irritate tissue and worsen the underlying imbalance.
- Wipe front to back to prevent introducing bacteria from the rectum into the vaginal area.
Do Probiotics Help?
You may have seen claims that probiotics can restore vaginal balance during pregnancy. A randomized controlled trial published in the American Journal of Obstetrics and Gynecology tested this directly, giving 320 pregnant women either an oral probiotic containing two Lactobacillus strains or a placebo for eight weeks. The proportion of women with normal vaginal bacteria decreased slightly in both groups, with no significant difference between the probiotic and placebo groups. The researchers concluded that oral probiotics, at least as administered in that study, had no measurable effect on vaginal health during mid-pregnancy.
That doesn’t mean probiotics are harmful, but they shouldn’t be your strategy for addressing smelly discharge. If you have an active infection, you need targeted treatment, not a supplement.
Why Self-Treating Can Backfire
The symptoms of BV, yeast infections, and trichomoniasis overlap enough that it’s easy to guess wrong. Using an over-the-counter yeast cream when you actually have BV won’t help and delays treatment for a condition linked to preterm birth. Going the other direction and taking someone else’s leftover antibiotics could wipe out protective bacteria and trigger a yeast infection. During pregnancy especially, getting the right diagnosis first makes a meaningful difference for both your comfort and your baby’s safety.
The CDC lists foul-smelling vaginal discharge as an urgent maternal warning sign, meaning it’s something to act on promptly rather than wait out. A simple swab at your provider’s office can identify the cause, and most infections resolve within a week of starting the correct treatment.