Preg or period symptoms

I’m supposed to get my period in like 6 days. My boyfriend cummed in me about 3 weeks ago & for the last week and a half my boobs and nipples have been in so much unbearable pain. Usually when I’m about to get my period my boobs hurt a little for a short time, never this long and hurting this much. I’m not sure if this is a sign of pregnancy or is it maybe because I’m suppose to be getting my period in a week.