Hello, I'm currently 24 weeks pregnant. Since this week, pain in the l…

Hello, I'm currently 24 weeks pregnant. Since this week, pain in the lower back has started bothering me, sometimes even painful to walk, pain in the ribs and spine if I sit for a long time, the belly is small, but discomfort is constantly present in the lower abdomen, the pains are not sharp, but just like dull pain. There are worries that it's not normal, although the doctor says otherwise. Also, the baby has become very active since this week when I sit and lie down, coughing and pinches feel constant, I am worried maybe there isn't enough oxygen? Suddenly anyone who has encountered something similar? I don't have an ultrasound soon, so I think I should go to