Is their something wrong with me or him?

3 weeks ago my SO came in me twice (Monday). He did the same thing the next day (Tuesday) . The following week he came in me (Monday and Tuesday). Then last week I didn't want him to cum in me because I didn't want to get pregnant ( I just wanted to know what it felt like and it feels amazing, if I got pregnant I wouldn't mind having a child). Then last  Thursday I got my period it was heavy from the first day. Usually it's light then progresses. Well I ended today giving me a total of 4 1/2 days of a period which is normal but I just want to make sure nothing is wrong. Please give some input. 

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