What would be the cause of extreme pain right when I begin having sex and bleeding afterwords?

I had sex two nights ago and everything was perfectly fine. I had sex last night and right when I got on top of him, I had extreme pain. I also had some bleeding afterwords, but not a lot. I am a little scared as to what is wrong. Someone please help?What would be the cause of extreme pain right when I begin having sex and bleeding afterwords?It might be that when you go on top and bottomed out, he hit your cervix. Is he really long?

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