Hi! I Was Prescribed Xanax Today. I Took One This

Hi! I was prescribed xanax today. I took one this evening and will be taking the recommended two tomorrow. I am a 130 pound female that doesn't regularly take any medications. They are .5 mg. I am going out this weekend and plan on drinking quite a bit. Is this safe if I take two tomorrow and don't have any xanax Thursday or Friday and drink Friday evening?