Help - huge work conference

Hi everyone, help! I’m leaving tomorrow for a big work conference with team dinners (and drinks likely) every night. I’m 4 weeks pregnant and obviously not drinking. It’s also my first time meeting most of these people as I was hired remotely earlier this year. What’s the best way to excuse myself from not drinking? I feel like the “I’m on an antibiotic” or whatever excuse is so obvious. But at least my one boss knows I drink cuz I’ve met her and had wine before. So what’s a good reason now?? Is it weird to say I’m trying to lose weight or something?