You DON'T want to hear my labor story-trust me! 
Prenatals are vitamins, so I would think it couldn't hurt to be taking them, even if you aren't pregnant.
My friend Sarah found out last week that her baby has died. She was 18 or 19 weeks (due in October). She hadn't felt the baby moving and went to the doctor where they confirmed it. 
They have 1 girl (age 12) and 5 younger boys-they were really hoping this was another girl, but I'm not sure they know yet what it was.
Another friend was pregnant, but suspecting something was wrong. They did an ultrasound and confirmed it-everything formed properly except there was no baby. They told her she could wait and miscarry on her own, or do a D&C. She chose to wait. Last week she went back to the doctor and they did another U.S. and told her that because of the way things looked, there was a great risk of hemorrhaging so she really should do a D&C. She scheduled it for last Friday morning. Friday morning, as she was getting ready to leave, she started bleeding very heavy so they left early. Her husband called the hospital and a nurse told them to stop at the nearest fire station and get an ambulance-which saved her life. When they arrived at the hospital, she was losing consciousness. Her blood type is A-, which is extremely rare, and they had none available. They did a transfusion into her jugular vein of another blood type, and then did the D&C. She was in ICU over the weekend in critical condition, but she came home yesterday-very weak, of course, but doing much better!
Thank the Lord for miracles! 
It makes me appreciate the healthy baby that I will soon be able to bring home even more (aches and pains and all!)!!!