I'm not sure but I do know I'm 27 weeks and she moves a lot more now than she ever has.. If your worried then definitely call your doctor. I was told 10 movements within 2 hours.
If you are far along and stop feeling your baby move you need to call the doctor. I've had many people tell me stories about unbiblical chords and other complications. If the baby is under stress it can't be active
My daughter moved less. So much so that I was concerned a little. Ended up going into labor that night