marciemi, I'm no expert, just a mom but I'll tell you what I did. My ds has been dating the same girl for about 15 months. I have talked to my son by himself and with him and his girlfriend about their relationship, sex, the consequenses of having sex etc. At first the conversation was one sided but after a few minutes his gf started talking. She let me know that she has no intentions of being a teenage mother, not that any of them do. She told me her mother would throw her out of the house if she got pregnant, I believe her mom would. We have had those types of conversations more than once. The rule at her house and my house is that they can not be in the bedroom with the door closed. My house is very small so I don't think they would try to do anything with the door open. In reality if they want to do anything they shouldn't be doing they will find a way. I'm lucky that they have watched two of their friends become parents and are seeing how hard it is. That made a huge impression on them. All I can say is keep the lines of communication open and try not to be too surprised when they tell you things that are shocking. Staying calm seems to help.
I sometimes tell my DH, "His 13 is showing."
I've written notes every day for the last week, to my best friend ,about something frustrating this kiddo has done for the day. Mostly its school work. Mostly lack of effort on school work. UGH. Its killing me, really. I know its normal and reading your posts really makes me think so, but its still really, super frustrating. 
Isn't that the truth! We want open communication, we better be able to handle it and if we can't we must hide our shock well
Not even sure where to go from here. Thanks for any help and I can't wait to meet you all!
and a hot tub! oh dear
Looks like I'll be losing sleep. (j/k)