Sooo dumb question but I need advice. Last night my husband and I were doing the deed. After we noticed the condom had came off and was inside of me. I have had my Mirena IUD for a month now, and my period is due in 9 days. I just had my son 11 weeks ago. Do you guys think I should take a plan B or do you think my IUD would be okay at preventing anything? I really don’t want to end up pregnant again but everyone keeps saying my IUD is effective.