Does drinking alcohol affect the effectiveness of my oral contraceptive pills?

Generally not. The pill is absorbed into your system where the hormones act directly to prevent egg release. Social drinking has no direct effect on the hormones effectiveness.

Alcohol may or may not affect the contraceptive pill but it has many harmful effects. Alcohol is a poison that never did anybody any good, ever, so stay away from it. It will destroy your brain cells, facilitate development of cancer in many organs, including breast, cause hepatitis, cirrhosis and pancreatitis etc. There is no safe level of alcohol intake. Quit while you are ahead.