I want to add my congratulations to you for your dd coming to you. When I was a teen, I wanted very much to be able to talk to my mom. She would have been understanding about anything I told her, I know that for sure. But...and this is a BIG but...she would have told my dad anything and everything I might have confided in her, because she didn't believe in keeping anything from my dad. Believe me, I DO understand that, but on the other hand, I think some things are better left between dd and mother. Unless dd has no problem with her dad knowing.
As a result of my not being able to talk to my mom when I needed to, I made sure that all three of my dc knew that they could always talk to me and I would always respect their confidences. My dd1 came to me just before having sex, and we discussed the pros and cons...protection, the love aspect, and so forth. She has told me that it meant so much to her, to be able to confide in me. I
you for having that kind of relationship with your dd. It's not easy, knowing that your "baby" is having sex. But at least when/if there are problems, you will be the first she'll come to. Good luck mama.