Is this normal ?

Hey guys. Im 19 weeks and 1 day pregnant. This is my first time pregnant and I'm a little worried. From yesterday I have feeling very uncomfortable abdomen plus pelvic mild pain. I don't know if that's happening because of the uterus expanding or not. I feel pelvic pressure which is felt to my buttocks. Should I be worried? Or has this happened with anyone during second trimester? I need help here please 🥺