My best friend in the world is crazy and has had a VERY terrible life. She didn't have the best parents and went through A LOT of sexual abuse and ever since then has been obssesed with older men. Well she fell in love with a guy who was about 36 when she was 16 (twenty year age difference), and she ended up pregnant. Her parents let her move in with him since they couldn't support her and the baby. Her parents wanted to call the police but she turned 17 before the baby is born. Do her parents have the right to call the police because she got pregnant before she reached the age of consent?

The parents are within there rights to file a complaint with police or with the District Attorney.

It is the "conception" of the baby, not the birth, that determines whether a crime is committed and what age the minor was when the sexual act occured. If the minor was under the age of consent at the time the sexual intercourse took place, a prosecutor would likely file charges against the man based on the age of the minor at the time the baby was conceived. The birth of the child would be evidence for a prosecutor as to the approximate date of conception thereby determining the age of the minor.