BFN 6 days before AF...in a wedding in 4 days!

Hi ladies. I’m a matron of honor in my cousins wedding on Saturday and I’m in the TWW. I got a BFN this morning. I’m the type of girl who’s gotta know, so I’m testing every day, lol. If I don’t get a positive in 4 days, do you think it’s safe to drink at the wedding?! I could use a little liquid courage for my speech! Period is due In 6 days. Also, if no BFP by Saturday should I consider myself unsuccessful this month??Thanks!