Having a few drinks at 5 weeks pp?

My SO's birthday is on the 22nd, and I will be 5 weeks and 3 days pp. If I have say...3 drinks, shots specifically, will it have a negative affect on my supply? I know alcohol is dehydrating, and I don't want to do anything that could negatively impact my supply. Also, I should definitely pump and dump this milk for several hours after, right? I know I don't have to if I have one drink, but I'd like to have a few, lol.