What was the name of that movie ?

One women plus boy friend and another women pregnant. Pregnant women is living in the basement, or is a prisoner. The boy friend sneaks down in the basement and rapes this women. He gets caught and his girl friend kills him. Now pregnant women is diffidently being held against her well and the other women wants her baby. Long story short pregnant women escapes through basement ceiling coming out of Kitchen sink and escapes. One more thing there was a time when a Doctor was call to examine the pregnant women who now is drug but before she is drug she carve on her stomach i think ! help me. Sure hope somebody out there can help me.