Best friend getting married, 3 bridesmaids (including me). Chief bridesmaid is her sister in law to be. We've organised a surprise hen party to Cardiff for 10 of us altogether. It's on Saturday, we had 5 twin rooms booked at a hotel for everybody, meal out, activities etc. It was all sorted to be paid for on the day with free cancellation on the rooms.
I'm 31 weeks pregnant, been struggling with SPD which has suddenly got worse this week to the point where I can barely walk. I'm going on the train to Cardiff on a service where I couldn't reserve a seat plus there's lots of walking around the city to do so my midwife has warned me not to go. She says if I keep going at this rate I'm going to end up on crutches. I've voiced my concerns with the bride and bridesmaids in a group chat and they've said that my health and the baby are the most important thing at the moment so are being lovely about me not going.
Then the chief bridesmaid messaged me saying that I'd still have to pay for my share of the hotel room (£80) even though I'm not going because there are no single rooms left for the odd person to take and she can't have a triple room with 2 others as there aren't any available.
Today, my husband, sisters and mum have gone off their heads at me saying I'm a mug for wanting to just pay the money. They don't think I should have to. But I don't think that the girl I was sharing with should have to pay double for her room. I can't see any way around it. Any advice would be lovely as I seem to be on the shitlist because of this 