So today I was told I had a bacterial infection, the Dr. Gave me metronidazole to insert in me at night for five nights, I've been reading online questions and answers about using it and it says it can cause birth defects and miscarriage in the fisrt trimester but on Saturday I will 13 weeks and in my second trimester so is it safe to use or am I at risk for a miscarriage and birth detects? My ob prescribed it to me and didn't mention any of the risks..