TMI... constipation in second trimester

Sorry this is probably a bit of a tmi but I am 15w 2d today with my first baby and I have noticed I’ve been constipated since getting into my second trimester. I had a bowl movement today and was bearing down pretty hard and I am now having abdominal pain. It almost feels like soreness on the left and right side of my lower abdomen. Should I be worried about my baby or is this just muscle strain or round ligament pain? I have noticed I have been having more lower abdominal pain like I pulled a muscle if I get up too fast or turning over in bed. This feels kind of similar. Sorry for the dumb question. Thanks for your help!