Scared to have sex after childbirth

My husband wants to have sex soon (I’m 4 weeks postpartum yes we waiting until 6 weeks) but to be honest I am scared. Is it gonna hurt? After pushing my baby out I cannot imagine something going back in lol. I took a mirror down there and maybe it’s all in my head but I think my vagina looks weird now from how much it stretched. I feel ugly also covered in stretch marks.