I just read a text message that my daughter ...

HI,  You approach her as a loving , caring , concerned parent  after you get your emotions under control .  If you accuss and attack she will withdraw from you , she may also feel that you invaded her privacy by reading her messag .  Ask her about her relationship with her BF and take it from there , tell her you are concerned and why you are concerned .  Have that sex talk again .  Talk to your daughter , find out what is going on in her life .

First of all you have not told how old your Daughter is. Other's may say the age doesn't matter, but it does. There are certain ages by law that a parent cannot do anything. I worked in a high scholl for 12 years and I ran up against age quite often, as did the parents. I would need to   know her age before I feel I could really answer this truthfully.

I would have to ask you a few questions first before i even attempt to reply.

First, how old is your daughter?

Second, how and why were you able to look at her text messages?

Finally, how close are you to your daughter, is this a familiar topic of conversation between you and her?