Strep throat during pregnancy

By trimester

Weeks 1–13

1st trimester

A sore, sudden-onset throat with fever in the first trimester is worth a same-day call to confirm it's strep with a quick swab, since a high fever this early has been linked to a slightly higher chance of certain birth defects. Getting a fever down quickly with a provider-approved option matters just as much as the antibiotic itself, and standard options like amoxicillin have a long track record in early pregnancy.

Weeks 14–27

2nd trimester

The same-day-swab approach still applies in the second trimester: sudden, severe throat pain, fever, and swollen glands are worth calling about, especially without the runny nose or cough a typical cold brings. This is also a good time to know that the 'group B strep' swab your provider does later on checks a totally separate bacteria, so a strep throat now has nothing to do with that later result.

Weeks 28–birth

3rd trimester

Late pregnancy is exactly when your provider does the routine group B strep swab, usually around 36 to 38 weeks, which can understandably make a sore throat feel confusing timing-wise. That vaginal and rectal swab checks for a different bacteria than the one behind strep throat, so a positive or negative result there has no bearing on a sore throat you're dealing with now. If strep throat does show up this close to delivery, call the same day: your care team will want to get antibiotics started quickly with a newborn on the way.

What does the evidence show for strep throat?

• Pregnant women have a higher chance of a severe group A strep infection than other adults, so a sore throat that comes on fast and hard is worth getting checked the same day. 1
• The 'group B strep' swab done around 36 to 38 weeks checks for a different bacteria that normally lives in the vagina and rectum without causing symptoms, not the bacteria behind a sore, strep-y throat. 2
• Penicillin and amoxicillin are still the antibiotics doctors reach for first once a swab confirms strep throat, with clindamycin as a solid option if you're allergic to penicillin. 3
• Most research on amoxicillin during pregnancy hasn't turned up a higher chance of miscarriage, preterm birth, or low birth weight, which is part of why it's such a common first pick for strep throat. 4
• A sore throat alone can't confirm strep, so providers use a quick swab or rapid test to tell it apart from a viral cold before starting antibiotics that lower the chance of rare complications and shorten how long you're contagious. 5
• Streptococcal pharyngitis classically brings sudden onset of sore throat, fever, pharyngeal inflammation, and tender cervical lymph nodes, with tonsillar exudate, palatal petechiae, and uvular edema, while suppurative complications occur in roughly 1 percent of patients and include tonsillopharyngeal cellulitis or abscess, otitis media, sinusitis, and bacteremia. 6

When should I call my provider about strep throat?

The classic strep picture arrives abruptly: sore throat with fever, tender neck glands, and exudate or pinpoint spots on the palate, typically without the cough and runny nose of a cold. Get a swab the same day rather than waiting the week out, because group A strep left alone carries the risk of rheumatic fever and kidney damage. Escalate faster if the throat pain turns one-sided and severe or your neck swells, since suppurative complications such as tonsillopharyngeal cellulitis or abscess turn up in roughly 1 percent of cases. A spreading skin infection, or fever and chills with feeling profoundly unwell, can signal invasive group A strep and belongs in urgent care. If you are ever unsure which side of the line you are on, make the call. Obstetric teams handle these check-ins as routine, not as overreacting.