Girls have been having pain in their crotch and lower abdomen for two …

Girls have been having pain in their crotch and lower abdomen for two days now. Could it be that a child is pressing on a nerve only when I lie on my left side does it go away. At night I couldn't sleep because of the unpleasant pains. As far as the ultrasound is concerned, everything is normal, there is no tone. The doctor says so, it happens with all pregnant women, he says it could be due to osteochondrosis. Does anyone else experience this?