I need help

I've had nexplanon for a year now and haven't had an complications and always get a period...my husband and I had sex on Fri but he pulled out before he came but i'm worried about pre c. My period is spose to start in 3 days and my nipples are red and a little sore i'm panicing that this could be an early pregnancy symptom...I know i'm probably over reacting but is this normal???