I can only imagine the comments to RockQueen about stepping up her parenting and just saying no, don't have teenagers yet or have those little angels I'm told some people are lucky enough to end up with
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Almost as soon as my son turned 13 the hormones kicked in and he became argumentative, sneaky, evasive and secretive. I know for a fact that things he has told me he doesn't do, he does. Nothing like having sex, drugs or smoking (I'm pretty sure) but just what he watches online and things like that.
He's 14 now and doesn't have a GF but if he did and was having sex I really don't know what I'd do. But it wouldn't be for lack of guidance and parenting, and I'm sure it's not for you, RQ.
It can't help if you are not being supported by his father. Does your DS know that his dad thinks it's okay for him to have sex? Because if teenagers suspect a less than united front they'll exploit it for all it's worth, "Dad says it's OK, you're just being sad," etc.
If I were in your situation I would try and make sure you had a united front with your DH and parents, and your ex as well. Your DS obviously knows what the rules are as you have told him, but he must know that he can come and talk to you about it - he probably feels as scared and worried as you do. Make sure the lines of communication are kept open and he doesn't feel shut out from you. He's still a kid and needs his mum.
Yes, tell the school, they need to know. And tell him you are telling them. He'll hate you for it (for a while) but they will hopefully talk to him about it in a caring and discreet way.
Good luck - I'm sure he'll come through it and so will you x