Does ampicillin delay your period?

Question

I took ampicillin for 3 days last week. And now I'm 4 days late. I didn't have sex for the past 4 weeks. I did took a test 2 weeks ago but it was negative. Could ampicillin be the cause of my period delay?
PS: I'm having a really bad headache but I'm scared that taking acetaminophen would delay my period even more :/

Answer

Acetomenophen will not delay a period. But it's not what you should be taking for a headache. Ibuprofen would be more effective. If you are taking BC pills, then any antibiotic renders it useless. Therefore you need to have a backup form of birth control for that month.

Does ampicillin delay your period?

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