It seems to happen to a lot of pregnant women and it turns out to be nothing. Is baby still kicking? You don't have any other symptoms like itching, painful urination, hesitancy urination, ect?
Go to the hospital. Much safer to be there and be normal than stressing about what it could be
Can b completly normal but jus check incase. May do a scan to check things
Go to ER. Just to be safe...