pregnant , or pms any advice is appreciated

last month my bf and i had un protected sex. two weeks before my period was due, i got really sore breast,nausea,tired and cramps. i got my period a week later and it was light, and very crampy, so i thought bad period. This month, we had unprotected sex from the day i ended my last period until today, im certain i may be pregnant. Ive been very tired,moody,sore breast,cramps off and on that feel different then pms ones,headache that wont go away,weight gain in belly, hunger, nausea when i dont eat. My period is due this sunday the 20th and im not sure if i should believe im preggo or not. My sister in law had a dream that someone close to her and i died. And when she has those dreams someone in the family ends up being pregnant. I was the only one other then her that was close to this person. Im stuck and dont know if i should be testing or if this is just period. Oh i also have been constipated, and had diarriha for a day this week.I also have not have my normal break out before period due.

Please any advice will help!!!!
we are hoping for a baby.