worried

Okay so I had my period on may 28th (start date) it ended shortly after, my fiancé and I had sex the day after it stopped. He did not finish in me. About a week ago my boobs have been extremely sensitive and kinda very sore, including my nipples. I also had period cramps for 1 day and they haven't returned. Obviously my period shouldn't be here for still 2 more weeks. Why is my body feeling like this? Did anybody have a similar situation?