And sometimes they just get very lucky. My friend had a horrible etopic pregnancy when she was young and has wanted kids forever and the doctors said because of all the damage she went through she would probably not be able to conceive, also she's 4'11" and 100 lbs. Had a bunch of miscarriages. She just had a daughter last year and is quite possibly the best mom ever. They said it was just extremely lucky and healthy. <3