Bleeding after sex

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Hey so I had sex with a guy on the weekend and I started to bleed really bad... I'm not a virgin.. and I've had sex quite a bit so it was very unusual as it has never happened before!!! I chose to skip a period lately because I'm on the contraceptive pill and not sure if this has anything to do with it?!? I also had sex with another guy the day before and my vagina was hurting a bit the next day... any ideas?!?