AITA for leaving a mother's day celebration?

This is probably extremely petty and I'm willing to admit that but none of what happened yesterday sat well with me. I have 3 kids and I'm currently 22 weeks pregnant. This pregnancy has been much tougher than my last ones, probably due to the length of time between pregnancies (my kids are 13, 11 and 9). The ONLY thing I wanted yesterday for Mother's Day was to essentially "check out". I didn't want responsibilities. I wanted to relax, alone. Take a nap, possibly a bath, watch my TV shows uninterrupted, etc. It was my husband's day off so this should have been easily achievable. However, it was not.

My husband decided that he wanted to make it in to a family day. First up he wanted to go get ice cream with the kids (I hate ice cream so this wasn't fun for me at all). Then he decided he wanted to get a bunch of water toys for the yard for the kids. Meaning I had to go unpack bathing suits from storage because no one knows where they are, help set everything up, sit out there with them (youngest has Autism and prone to accidents/tantrums) and be fully "checked in". After awhile I told my husband "you've got this, I'm going for a nap". Which, he had no problem with. I fell asleep for maybe 30 minutes after the kids came in 4 separate times to "check on me and see what I'm doing" and then my husband coming in to wake me up because it was time to go see his mother and sisters and help them with yard work (plans I didn't know we had). So we drive out there, 45 minutes away and me already having a crabby fucking attitude.

When we get there every single time I go to sit down I'm getting called to come help with something and when I get back to the seat it's either taken by a dog or a kid. I go retrieve another chair and it's all "oh, thank you" and the seat is taken from me. All the kids in question are older (13-17) that were taking my spots and it's very much so a "the dogs live here, you don't" household so when the dogs took my spot, I was SOL because it's tHiEr HoUsE (my kids had been recruited to do yard work but none of the other kids had). So I told my husband I was "fucking done" and that what should have been a day for me to relax, as I requested, was completely destroyed. We end up leaving and my husband is pissed because he promised to help with yard work and it was cut short. I don't feel bad at all. AITA?