Flagyl is an antibiotic and is used to treat infections. Unless you have an infection there would be no point in taking it. You were pregnant in September, even though you lost the pregnancy. It does mean that there isn't a problem preventing you from conceiving.

Can I take Flagyl while trying to get pregnant?

There's no clear evidence to suggest that taking metronidazole will reduce fertility in either men or women. However, speak to a pharmacist or doctor before taking it if you're trying to get pregnant.

Can metronidazole prevent fertilization?

Based on the data available, it is not known if metronidazole can make it harder to get a partner pregnant or increase the chance for birth defects if taken by a father or sperm donor. In general, exposures that fathers or sperm donors have are unlikely to increase the risks to a pregnancy.