Tight/Stretching Feeling...?

Hi Ladies-

So! AF is due 12/4, according to glow and flow, i am between 6-10dpo. All today, I have been having this weird tight/stretching kinda feeling in my stomach and lower back. It feels like when youve been laughing really hard and your stomach starts to feel weird, only its been almost all day.

Has anyone ever had this before? What could it be? Ive been trying not to symptom spot but I just thought this was a little odd.