A hen night without bridesmaids

I have  two bridesmaids and one has just had a baby.  Reecently, we all met up and they asked me what I wanted to do for my hen do.  I said I wanted a weekend away somewhere in the UK.  They both expressed excitment at this idea and made it seem like they were all interested in coming.  Last week I got an email from the bridesmaid with a baby saying that she wouldn’t be coming and not offering any alternatives.  Then the other emailed to say that she couldn’t afford it and wouldn’t come. I feel completely let down and althoough I don’t want to fall out with them, I am really upset.  What sort of a hen do is this going to be if the bridesmaids don’t even want to come?  What should I do?