Metronidazole 500g tablet BV

Casey • I`m 30 and my husband is 29. I have a 12 yr old son and he has a 9 yr old daughter, we have a 5 yr old daughter together. We have been ttc since Oct 2013
Has anyone taken this and had spotting? I'm also worried because my Dr prescribed it to me during my 1ww I'm on day 3 of 7. I'm due for AF on 11-9 I'm just afraid it could interfere if I conceived.