First time cumming in me 🤷🏻‍♀️

So me and my fellla were having sex and it was really very good tbh! He then wanted to cum in me and I said he could 👍 Now bear in mind I am on birth control. But afterwards I got up and i was expecting semen to run down my leg but it was like bloody or browny?? 😳😳 I am only on the pill 12 days though. And it definitely wasn't his semen that was the problem for sure it had to be me 🤷🏻‍♀️ anyone have any sort of clue what happened? P.S we have been having lots of sex the last few days (I dunno if that's relevant or not)