So fed up, I don't know if I have the right to be annoyed but my OH brother is 18 on 24th and after…

So fed up, I don't know if I have the right to be annoyed but my OH brother is 18 on 24th and after payday this.month my OH has just said he's taking him out drinking, my OH doesn't usually drink and it's not that I'm annoyed at, I'm annoyed at the fact we don't have that much money and we have to cut everything down to make sure we have enough things for the baby, my baby will be due like 2 weeks after payday so we need to save as much as we can, but I no if I say anything to him it will cause an argument, I don't have money every week now due to having to finish work today so basically he said his money is now my money so I'm not happy with it at all and I no I can't just use the money to go out with my friends because we can't afford it😠😠