Pregnant and engaged

So this past week I found out I’m pregnant and also I’m newly engaged. I have a family party to go to this weekend and I’m scared they may have some type of toast with champagne or something and obviously I can’t drink that.

No one knows I’m pregnant because it’s super early except my fiancé. I don’t want anyone knowing in case something happens and will tell my parents after the first check up.

Any tips or tricks how to get passed a toast without people being suspicious? I mean I was just going to say I have an upset tummy and don’t want to drink or champagne gives me a headache but I feel like that is obvious.