Advice needed / keeping the secret until 12 weeks

So I got my positive this week and I’m completely prepared to tell white lies for a while. Well I thought I was. Talked to the husband and we have a plan to hide the no drinking thing and thought that would be our biggest problem but I have two friends getting married next year... and with those come hen parties etc. A good friend needed to know if I was up for her do that’s away from home and would need booked in advance. It’s around the time I would be having the baby or just after. I don’t want to ruin plans by lying and saying yes which is what I would like to say. Feels awful. I know she will know soon if things go to plan but I would hate the thought of her thinking I just don’t want to go. 😢 anyone else had problems with this?