heavy sore uterus 10dpo??

Megan
I know I'm symptom spotting but this one has me puzzled because I've never felt it before. (Not before I got pregnant and had a miscarriage OR before a period before.)
Woke up today 10dpo and feel like I can actually feel my uterus. It feels heavy and sore and crampy. I've had cramps on my right or left side, like by my ovaries, but never felt it right in the middle like this. Anyone else have this feeling? I'm just not sure if it could mean a BFP coming soon or the start of a bad AF. ): (I took a test this morning and it had a vvvvvfl but I also did the trigger shot this cycle so I can't trust any results for four more days.)