Cramping ~7dpo

Ra

I'm not sure where to post this.... Not trying to get pregnant, but definitely not preventing it either. Have been having unprotected sex since August 2018 with my husband. Not tracking with OPKs so I'm going off of Glow's estimate. Roughly 7dpo, 6 days til AF. Here is my calendar for reference.

Anyway, I'm currently cramping like I would when it's time to start my period. It goes from just under my belly button/ uterus, back to my left lower back/ kidney area. I went to the restroom and when I wiped I had a very very light shade of pink on the tissue.

I've never had cramping like this and it's rather uncomfortable. I don't want to get my hopes up for a pregnancy but I'm also thinking my period could come early? Anybody have any ideas as to what it could be?