Missed period

Kaylenkeel
So this the second time I missed my period & I haven't been feeling no pregnant hormones. When I went to the doctor for a STD check up they didn't find anything but they did give me some pills that day on the safe side & idk if that had messed my cycle up .. 😖idk I mean Me & partner used a condom I don't get it.  I'm trying figure what's going on with my body 😥