TTC and alcohol

So this is our first month TTC and I’ve just finished ovulation, lots of BD!

My question is, I’m about to go on a boat cruise with looooots of alcohol. And I’m worried...

What if I have fallen pregnant, but it’s within 2 weeks of conception (to early to test) and I may harm it....

I’m also going with family and don’t want to share that I’m trying, and not drinking wouldn’t be suspicious....

I’m so confused 😫