Goodmorning y’all!

I hope everyone is having a good day. I wanted to come on here to ask for some advice about what I should do. Yesterday, my fiancé and I had sex and I let him finish in me for the second time. I’ve been with him for 6 years (and been on the pill for 6+ years) and have NEVER let him finish in me until now. The first time I let him was in September. I took a plan B and my period lasted for like 10 days. I let him yesterday because my period is about to start tomorrow.

Even though I’ve been on the pill for a while, I still get freaked out about pregnancy and just want to be safe. Also I have a hard time understanding the cycle phases 😂. I thought it was fine for him to do that because I was about to start my period, but now I’m questioning if that was a good time to do that because my last active pill was Thursday. Should I take Plan B or should I not and just let my cycle be normal and trust the birth control in my system?