So me and my bf have recently started becoming more active sexually. We had sex for the first time on Thursday (31.01.19) twice (one protected the other not but I am on the pill) it was first time but not mine. After we got done I obviously went to the bathroom to pee and as I’m cleaning myself up I notice I’m bleeding(spotting kind)

I’m just wondering as to why I’m bleeding after we do anything as I didn’t bleed on my first time so why now?

Also just a little bit of advice, the second time it happened it was unprotected and he finished in me, I have been on the pill for 2 years and I take it pretty religiously, I should be fine right?