I had a 7 day period from October 4th thru the 10th. On October 12th I had sex and on October 16th I took Plan B. I then had another period from October 21st for another 7 days with a pretty normal flow except for the fact that it didn't stop after the 7th day. It would come. Go away for almost 24hrs and then come back. Now it's the 7th of November and I think it's finally over. Maybe. But I'm concerned now because my fertile window was thru the 1st week of November and I had unprotected sex on 3rd and 4th of November. How concerned with pregnancy should I be? Thoughts? Opinions? Thanks.