Canceled on brides bachelorette trip to Nashville, Am i wrong?

Bride and her MOH planned a pretty pricey trip to Nashville. Total of 15 girls planned to go, Airbnb alone was $700 per person and I knew there were activities planned that the MOH said were booked, but not paid for yet. MOH said expenses would be sorted out per person after bachelorette so everyone could enjoy.
I found out I was pregnant 3 weeks before her bachelorette and I am planning my own wedding. I told myself I would still go since I had already paid $500 for hotel and had one payment left to pay. Seemed like a lot to throw away. Week of her bachelorette I felt awful so nauseous, migraines didn’t want to do anything, but sleep. I admit I am wrong for canceling 24 hours before her bachelorette. I called her and said how sorry I am. We spoke about me paying the last payment for the hotel fee and that was all we spoke about expense wise for the trip that I was still required to pay.

I texted her MOH right after I got off the phone with the bride asking for her Venmo so I could send remaining payment. She texted me back a couple days later saying she was so busy she will get back to me after the bachelorette. I thought that was odd.
Three days after the trip MOH texts the group chat (which I never removed myself from) how much every girl owed for the weekend. 2 minutes later I get a text from MOH that the Bride requests I still pay for activities that I was not even present for. As she is texting me a balance that I owe $400 for last hotel fee/activities the bride is texting her thanks to the group chat. This pissed me off since last I spoke with bride I only owed the $700 hotel fee and there was no conversation had about activities I did not attend. Like I said before I am pregnant and also planning my own wedding so no sympathy what so ever from bride and she couldn’t even contact me herself. I called them TACKY because… one of her activities was bottle service at a night club! Bride and all her friends are late thirties-mid forties with careers. I think they can all afford to split the costs of alcohol they consumed. So I am pregnant at home miserable and you want me to pay for your alcohol? Crazy and I refused to pay for such activities. Other activity was pilates, and had she asked me to only pay this I would’ve said fine but for your alcohol no thanks. Lastly, I did the math and each girl that attended would only have to pay $10 more for the activities they did not me. Instead, she wants me to pay a total of $900 for something I didn’t attend.Am I wrong here? Should I just pay it?