Thanks to everyone for you comments and advice.
Being PG I thought about throwing a sicky to get out of hen do, I really don't want to go, can't afford it the money could be better spent elsewhere, like on school uniforms etc.
There's no-way that he will cancel going on the stag do now as that would probably embarrass him, but he knows how unhappy I am about it and he said the other night that thinking about it, if the roles had been reversed he wouldn't have let me go. He said that he wouldn't have agreed to go if he had thought about it more, typical male behaviour doesn't think how his actions will affect people around him then stares blankly in horror/ignorance when its pointed out.
I've made him sound like a real prick but actually he's a really nice guy just a bit thoughtless and selfish sometimes, but he can be really sweet too.
I'm gonna hate him going away and I'm probably gonna be evil with him when he comes back with a tan, but nothing I can do.
As far as me going away with mates to make up for it goes, folks we really can not afford that and I'd feel super guilty going on holiday when my kids are stuck at home. I don't have a problem with going away without them that would be heavenly peaceful but only if I take them away at some time too. I'm gonna think of some fun things to do with them while he's away and just enjoy having the bed to myself at night, at least I can have a good sprawl.
Thanks again everyone it's my 1st time on here and everyone's been really nice and helpful xxx