IM CONFUSION. Help me😭

So I’ve been taking birth control for 4-5 months and after a few weeks of taking the BC I let my boyfriend cum inside me without a condom. I know it’s unsafe but YOLO and I kinda like the feeling I get when he finishes🥵 Anyway most of the time he finishes in side me I’ll try to push the cum out on to a towel but when I’ve been going to the bathroom after we’ve had sex, when I wipe there pinkish discharge on the toilet paper. Now I got off my period like 1-2 weeks ago and now I’m spotting after sex. It’s just weird but it’s happened before and I didn’t get pregnant so I know it’s not the. Any answer to what it is? And do you think it’s a good idea to allow my boyfriend to cum in me even tho I’m on birth control? Also why does my uterus always cramp after I get cummed in? It always freaks me out so I just try to push it all out or go pee or something? Help me please I’m going crazy not knowing😭😭