Lower abdominal pressure at 13 weeks.

Destin • Pregnant with a rainbow baby ! Angel baby : (Olivia Jade)
Hello ladies! I'm currently 13w2d pregnant and yesterday I started noticing that its very painful to press up against my lower abdomen where my uterus is. it didn't get bad until this morning when my boyfriend went in to hug me and my belly pressed up against his pelvic bone and it made me scream. Although it didn't hurt that bad it scared me. I think it may be constipation (tmi) but whenever I try to "go" I see myself having to strain and it just still won't come. its driving me insane. Has anyone experienced this?