Pinching pain

I'm 11w with baby #3 (but it's been 16 yrs since I was last pregnant). I'm having pinching pain in my uterus and I remember having it before but can't  remember what it was.. Quickening or round ligaments. I do have some light quickening (butterfly wing sensations) but is the pinching also quickening or is it RL pain? Or something else? I figure since it's my 3rd I'm all stretched out and wouldn't have RL pain but it's been a looong time so I'm not sure what I'm feeling. Except it feels like the baby is pinching me! Lol!