Pulsing uterus?

Hi all,

I just stopped taking BCP at the end of august to TTC and I've been feeling really weird lately. I've been feeling really bloated and nauseous as well as feeling my uterus pulsing. I took a pregnancy test a couple weeks ago and it was negative. I haven't had a period since but it's not due for a few days.

I was on the pill for so long it's hard to tell if this is normal? Do you think it's early pregnancy symptoms or symptoms from coming off the pill?

EDIT : thanks guys that's very helpful! 💟