Vegas trip - how do i lie??? 😣

No

We've been planning a trip to Vegas for May 9-11 to celebrate my sisters and cousins 21st birthday. the tickets and hotel are already booked and all my cousins, aunt's, uncles and parents are going. we just found out I'm pregnant so I'll only be 7 weeks on the trip. I don't normally drink a lot but my family will definitely be suspicious if I don't drink at all. How do I fake this so that we can wait to announce it at 12 weeks?? 😬