Confused. Com

Amy
Hey I had my period on 19th August came off on the 21st August on the 31st August (,1,2345678910,11 ,112 September) I had been having sex on my fertility window I'm due on the 16th September Ive been have sex one or twice and he cumed in me x and I keep getting pains in both side and one of my breast is sentive too don't know what to do