Carrying low normal?

My baby has been kicking nonstop all on top for days even kicked my rib but the past two days she had slowed down and felt like she was in my lower abdomen cuz I could feel soft thumps there and it was muffled and not strong, for two days made me freak out, I'm a ftm. And around the same time my belly decided to get super full and feel like its going to explode like a balloon like Its run out of space, was gonna go to the doctors till today she decided and be active again, not as crazy but ive been getting my strong kicks back again, could she have just been resting low? When it felt like it I started having annoying lower back pain and hips are like a bitch and my sides like where my ligaments would be, I'm currently 28 weeks, ive never been pregnant before but I had assumed this is a normal start of 3rd trimester thing

The pain has been my lower back, hips, sides and leg joint sockets, heard those could he symptoms of SPD, has anyone had those symptoms?