Af or pregnancy symptoms? Please help!

July • About to get married next month
AF is due the 1st for me. And im having cramps but more than what I usually get which is light cramps three days before and thats how I know AF is coming. But this time it has been for the past three days. Also have sore breast and a ton of back pain. Might this be Af or might it be related pregnancy symptoms??? Any suggestions??