Girls, hi! I feel some movements very low down, like it's about to pop…

Girls, hi! I feel some movements very low down, like it's about to pop out. Is that normal? Or is it a sign of something? I know standard premonitions from my first birth, but here it's different. My belly hurts at night and there's a pulling sensation in my lower back. I can't go for an ultrasound because I took a PCR test yesterday ?