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Is it safe to take antibiotics during the 31st week of pregnancy?

This Premium Q&A, reviewed and published, features a real conversation between an iCliniq user and a physician.

Patient's Query

Hello doctor,

I am 31 weeks pregnant and recently experienced mild intermittent burning during urination. My urine dipstick test was normal, but the lab report showed bacteria over 2,000, though red blood cells and pus were normal. The report also mentioned that no culture was necessary.

My doctor prescribed Trimethoprim for one week, but since I have a Penicillin allergy and the symptoms improved with increased water intake, I have not started it yet. Yesterday, my doctor's dipstick test was normal, but today my midwife found leukocytes in my sample; possibly due to contamination, as I did not clean before collecting the sample. Please tell me,

  • Should I start the antibiotics or wait since my symptoms are mild?
  • Is Trimethoprim safe during the third trimester, especially as I am taking Folic acid?
  • Can it affect the baby’s brain development or lower folate levels?
  • Could the bacteria count of 2,000 indicate contamination rather than infection?

Kindly help.

Answered by Dr. Ali Osman

Hello,

Welcome to icliniq.com.

I read your query and can understand your concern.

From your description, you have experienced mild, intermittent burning during urination with a bacterial count of 2,000 on lab testing. Since your RBC (red blood cells) and pus cell counts were normal, and the flow cytometry suggested no need for culture, this might represent either mild bacterial colonization or contamination, particularly if the sample was not collected with proper cleaning.

However, in pregnancy, even low-level bacteriuria can sometimes be clinically significant, as it increases the risk of urinary tract infection (UTI) and, if untreated, pyelonephritis.

Typical symptoms suggesting a UTI include:

  • Burning or pain during urination.
  • Frequent or urgent urination.
  • Lower abdominal pain.
  • Cloudy or foul-smelling urine.
  • Fever or back pain (which may indicate upper UTI).

If any of these worsen or new symptoms appear, it is important to re-evaluate promptly. Pregnancy increases the risk of UTIs due to hormonal and anatomical changes. The main types include:

  • Asymptomatic bacteriuria (ASB): Bacteria in urine without symptoms (seen in five to ten percent of pregnancies). It must be treated to prevent kidney infection.
  • Acute cystitis: Infection of the lower urinary tract with symptoms like burning and frequency.
  • Pyelonephritis: Kidney infection with fever, flank pain, nausea, or vomiting, which requires hospitalization.

You can take the following medication for your symptoms;

  • You can take Nitrofurantoin (an antibiotic) 100 milligrams twice daily for five to seven days. It is generally safe during pregnancy but should be avoided near delivery, as it may cause hemolysis in newborns.
  • Cephalexin (Cephalosporin antibiotic) can be taken at a dose of 500 milligrams four times daily for five to seven days. It is considered safe in all trimesters of pregnancy.
  • Amoxicillin and Clavulanate (a Penicillin-type antibiotic) may be used at a dose of 625 milligrams three times daily for five to seven days, though it should be avoided in patients with a Penicillin allergy.

I hope this information helps you.

Feel free to ask further queries.

Thank you.

Patient's Query

Hello doctor,

As I am pregnant, my concern is regarding the use of Trimethoprim during pregnancy. Is it safe to take it?

Kindly help.

Answered by Dr. Ali Osman

Hello,

Welcome back to icliniq.com.

I read your query and can understand your concern.

We categorize urinary tract infections into three distinct groups.

  • The first category involves patients who exhibit symptoms, and when a complete urine examination yields positive results, treatment is necessary.
  • The second category pertains to symptomatic patients experiencing burning during urination, urgency, frequency, and dysuria, where a complete urine examination returns negative results; in this case, treatment should still be administered.
  • The third category includes asymptomatic patients whose complete urine examinations are positive, necessitating treatment.

Your situation falls under the first category, as you are symptomatic and your urine test results are elevated.

Trimethoprim (an antibiotic) is contraindicated during pregnancy due to its cardiogenic effects on the fetus, so I suggest the following alternatives: Tablet Cefixime (an antibiotic) 400 milligrams, to be taken once in the morning for seven days, and a Cranberry sachet, to be mixed with a glass of water and taken twice daily for 20 days.

I hope this information helps you.

Feel free to ask further queries.

Thank you.

Answered byDr. Ali Osman

Medically reviewed byiCliniq medical review team

Published At December 21, 2025
Reviewed AtDecember 23, 2025

Same symptoms don't mean you have the same problem. Consult a doctor now!

Dr. Ali Osman
Dr. Ali Osman

Obstetrics and Gynecology

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