Metronidazole With Birth Control

I started taking metronidazole 500mg tablets on 9/26 three times daily for 10 days and take progesterone only BC DAILY. I had intercourse on 10/1 and went right home taking my pill. I was to start my period somewhere between Thursday and Saturday (I'm irregular) and have not started yet, should I be worried?

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I didn't find any problems, or interactions listed, it is usually the level of estrogen that some antibiotics can alter that reduces the efficacy of some oral contraceptives, according to the NIH.

If you're concerned about pregnancy, there is never any harm in checking, but if you're irregular anyway, there is likely nothing to worry about.

Have you started, yet?

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