My DH's brother is getting married 4 weeks on Friday. It's an 8hr drive away and we're taking his uncle and mum in our car.
We have a 4 yo DD who's staying my sister while we're gone for 2 reasons. 1 being that she would be bored senseless as it's not really a family orientated wedding (booze orientated night before and no other kids going to the wedding) and we felt the drive would be too much for only going for 2 nights. And now, secondly, there's no room in the car as we're now taking the uncle.
I'm 6 months pregnant with severe back pain that I'm undergoing physio for. The drive down is not appealing for this reason.
I didn't really fancy it much due to the distance and now because I won't be able to soften the blow with alcohol! 
We found out at the weekend that when we get there the women and men are being split into two groups on the Thursday night so we're not even going to be spending any time together as soon as we arrive. I'd presumed we'd have a big family dinner since we don't see his brother often and I thought he would've liked to have spent the time with his mum and all of us before the wedding. So this means we'll get there then DH will be going off to the the pub and I'll be left with all the women in his family and the bride to be. This has tipped me over the edge tbh and I've been quite upset about it. I'm emotional anyway just now and in pain and I'm upset I won't be spending any time with DH practically the whole time as he'll be with his brother from the morning of the wedding until we get to the reception.
Additionally, I've been saving for a few months as I knew it would be expensive but now his mum has recently been made redundant and has no money so we're having to pay for her hotel, meals, drinks and everything when we're there. This is leaving us really tight with Christmas coming up , the baby and me going into mat pay.
If I don't go DH could share a room with his uncle which would be cheaper and obv less on meals etc for me anyway.
But I feel really guilty about not going, it's DH's brother wedding. There's been no question of me not going up until now.
Really looking for impartial advice please.