My Daughter became pregnant when she chose to have sex for the first time @ 15. She is now wanting to sleep ov?

My Daughter became pregnant when she chose to have sex for the first time @ 15. She is now wanting to sleep over at his and his Father's house although I have told her "NO" and have been telling her no I get the feeling its only a matter of time before she runs away again. I am considering calling and talking to the boys parents before this happen's yet I dont want to further push my daughter away.I have asked her to ask her boyfriend for his Mother's # out of respect but I feel the need to just text him (her boyfriend) directly and ask for both his Mother and Father's phone #'s......Oh and BTW, she is was put on the pill immediately following the miscarriage.