Amusement park?

I’m 5 weeks and will be seeing my OB on Friday. My two daughters and I are going with my parents and brother to an amusement park on Saturday. I’m not quite ready to tell them yet, but I’m not sure how to get around it!

Thankfully none of them ride big coasters, so that won’t be an issue. We’re mainly going for my girls, but I KNOW it’s going to come up. I won’t be able to ride the kiddie coaster with my oldest. Some smaller, “family” rides are going to be off limits. The website says you can’t even ride the carousel?!

Tips?! Is there any way to skirt around this?? Obviously I’d choose to tell them before putting myself on a ride just to avoid it. I just really wanted to wait a little longer!