Metformin & Alcohol?

Kristen • Been with my husband for 4 years. Married since March 2015. Praying our little miracle is on its way as we TTC #1. ❤️
Can you drink on metformin?
I haven't drank since I started my medication on June 28th. 
My friends stagette is this weekend and I wasn't going to get drunk by any means at all but wondering if you can enjoy a glass of wine while on these meds ??
I don't need to drink but wanted to have ONE drink if it wouldn't effect me in a negative way. 
Thanks !!