I currently off sick from work with pregnancy related complications and 7 months pregnant so probably a little hormonal and have already been crying down the phone to DH about it 
Anyway my step dad arrived today to help out with my little boy today (currently not very mobile and if I were working he’d be with him on a Monday) and told me that he and my mum would be away for my birthday (4 nights total) I had already made plans with my mum for my birthday and she’s made a big deal about not going to another event because it was my birthday.
My mum hasn’t told me anything about this getaway, I suspect that she’s gotten DSD to tell me so she didn’t have to (she has precious for this). I didn’t say anything to DSD about it but I’m really upset that I’m being told my birthday isn’t important and the plans we had aren’t happening.
My DM would and has hit the roof if I even mentioned not being with her on her birthday ( I am expected to take annual leave from work for her if it falls on a week day) this year I even went to and paid for a cocktail making class and afternoon tea that she wanted to go to for her birthday despite being pregnant and unable to participate in most of it.
Do you think AIBU to have a word with my DM about it or should just let it lie?