Some women will have some cramping, similar to menstrual cramps, off and on in early pregnancy. Some will get a sharp "catch" if they move too quickly in changing positions. If it sounds like one of these types, it is likely just some of the normal aches/pains women may experience in pregnancy. If you are unsure or it seems more severe to you, check with your doctor or midwife.

Go to a doctor asap... its better to be safe than sorry. :)