My partner and I had unprotected intercourse when my period was ending; maybe the last day, the 20th .. And about 4 days later we had sex again and decided to take a plan b, and my fertile window was on its first day. Will the plan b still be effective? The next day we had intercourse again but didn’t take any precautions afterwards. I don’t mind getting pregnant at this time, but what are the odds here? I’m kinda all over the place right now lol