Hello everyone) I don't know how to ask the right question, (explain…

Hello everyone) I don't know how to ask the right question, (explain everything, I hope you understand correctly ?) My child is moving very low, and sometimes, I feel from inside - from below as if he's about to come out, just jumping up, from pain... I can't explain the sensations properly with words... Can anyone understand me, please explain it, is this normal or not? And why is it like that... As I explained... Thank you in advance for your answers and understanding ❤️