How did what happen, Do you mean why is this happening or are you asking if you're pregnant?
Generally having unprotected sex leads to missed periods and pregnancy! You need to get yourself a home pregnancy test and see if your test comes up positive. This is the only way to know for sure. If you are having sex and not using birth control or not using birth control every time, all the time, or not using it properly then pregnancy can happen. Missed periods and sore nipples are strong indicators of pregnancy.
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