what would you do?

My hubby and I planned on going out for the night on New Years baby free for the FIRST time since my son was born 17 months ago! AF is due that morning after. I really wanna let loose and enjoy one last time before hopefully getting pregnant with baby #2, but would drinking at this point be risky if I won't know yet at that point if I'm pregnant? I wouldn't take a test till my period was totally missed or really late (trying not to be pee on a stick crazy anymore). Ahh I feel weird even typing it out but I don't know what to do