3 DPO. Just wondering?!?

[CACH12]

I got my peak results on Sunday, O most likely the 21st. We BD'd 15, 16, 18, 20, 21, & 22. I had pains on and off on both sides. Now I'm 3DPO and I'm still having cramps/sudden pains and now back pain (very low.). Are these pains associated with O? I know I'm way to early to have any true symptoms but these symptoms are on going and I was wondering if I could have just O'd late or something?!? Any insight appreciated! TIA