When I stopped using the Pill I never drank alcohol once I had had sex that month and before af. It made me very boring at parties, but I made up for it once af arrived. I had read somewhere that day 17 was the most crucial, and this is before most women would know they were pg. It was probably rubbish, but it was right next to a picture of a brain with foetal alcohol syndrome. I just couldn't get that out of my head.
About prozac, I would ask your doctor first as you need this, alcohol and ciggies are a choice.