I hadn't had a period since I got my Nexplanon/Implanon, 6 months ago then two months ago I got my period. This month my BF and I had sex while I was on my period (the last or maybe second to last day of my period) he of course finished off inside me. I took a pill called "primrose" soft gels for the cramping I had on the first 2 days of my period. I want to know if there is any risk of me being pregnant. I know that the Birth Control is 99%+ effective so I'm just wondering if this is all in my head? Could that pill mess the Nexplanon even tho it's not an antibiotic? should I consider the Plan B just in case?