Girls, hello everyone! I have some strange sensations, for about a wee…

Girls, hello everyone! I have some strange sensations, for about a week and a half it's been going on, on Sunday I'm going to the doctor, but still decided to write here, maybe someone had something similar? When I get up and walk, sometimes sharp pains start at the bottom. It feels like a little baby is very low and pressing in. The pain lasts a couple of seconds, but it's terribly unpleasant. What could this be?