To answer your question, it definately does! The pill mixed with alcohol, drugs other prescription medicine can have a huge effect on the effectiveness of the pill!!

i found this info


Drinking alcohol does not affect the effectiveness of the birth control pill. However, if a woman has too much to drink and throws up within a few hours of taking the Pill, it may affect the effectiveness of it.

Keep in mind that mixing sex with alcohol or other drugs increases the chances of unintended pregnancy and exposure to sexually transmitted infections. This is because if a person has sex when she or he is drunk or high, that person is much less likely to be thinking clearly enough to use condoms, use them correctly, or practice other kinds of safer sex.

Ohh okay maybe im wrong....Im just going off what my doctor has told me.

Last week, I took the pill at my normal time (11pm) and about 30mins later my friends and I started drinking. I drank about a third of my drink when I started feeling sick to my stomach. I don't know if it was due to the mixing of alcohol and the pill or something else. But it passed a couple minutes later when I had some carbs.