To bail or not to bail as a bridesmaid??

Where do I start??? I was ask to be a bridesmaid in May for a following years wedding in September. I gladly accepted since my best friend and I have been friends for ten plus years ( our friendship has been fading the past few years due to many life events such as moving, relationships, and just life in general.) Anyways… A few months later I found out I was pregnant and due in June, about 3 months before the wedding. Fast forward and now many months have passed before the MOH and MOB finally get everyone together to talk shower ideas. At this meeting ideas were thrown around but nothing solidified besides the MOB stating the bridal party was responsible for all but the venue and food at the shower (around 50 guests invited). There are 5 in the bridal party and all agreed on the conditions. Another few weeks pass and still nothing solidified besides a shower date. The MOH said she would just let us know what she needed/ responsibilities. After many “how can we help” texts from other BM’s and trying not to overwhelm the MOH we are finally getting information about the shower. It is now Almost February for a March shower where everyone was finally individually told their responsibilities. I am responsible for all the alcohol because I live in a tax free state. This includes the favors of mini wine bottles and sangrias/mimosas for the shower. When I got this assignment I just said okay and didn’t think about it until a few hours later. It struck me that this is completely unfair to be the only one responsible for this amount. Other BM’s are responsible for games and decorations while I’m stuck with the alcohol. I assumed all would be split evenly between the 5 BM’s but that is not the case. To add more fuel to the fire… the MOB bought a combined gift for the bridal party without anyones consent. Myself and another BM already purchased gifts ourselves. And to top it all off.. the bachelorette party (out of state) will be a month after I give birth and I will not be able to attend. Also, I will have a 3 month old at the time of the wedding and probably won’t be able to fully participate in all the traditional bridal party getting ready events. I don’t want this to ruin our friendship, but I am really stuck between a rock and a hard place on what to do. Any advice???