4DPO Pinch in my uterus?

So I know I'm early but I've been feeling a little pinch in my uterus today. Not super painful but I definitely notice it. BD on ovulation day and praying for the best. Also (maybe TMI but we), having a weird relationship with pooping??? Like sometimes I'm constipated but when it does come it's like 🌋. Anyone who's been pregnant have any idea?