So i usually have 7 day period. Last month my period was different(not as heavy, ended earlier). I had sex w my bf day 1 and 2 after period ended. On day 3 after my last period ended i had discharge that i think was early ovulation bc on my "expected" ovulation day i had nothing at all. We used condoms and i know it didn't break but when we ran out we just did pull out. I didn't get plan b bc they were out at store. Ive been tired lately, almost falling asleep at work and headache at work as well as nauseous through out the day. (I been snacking which has been helping) . we had sex again last night and today and i took plan b this time. Is it possible i could be pregnant still? Im supposed to start next Saturday. Has anyone had any of these symptoms? Anyone want to share signs they noticed before missed period?

P.s. im supposed to get on depo shot May 10th.