Hello dear
I understand your concern
Do not worry
Alcohol doesn’t impact micro pill’s effectiveness.
Hormones in birth control reduce your liver’s ability to metabolize alcohol.
This can lead to high blood alcohol levels and may increase your level of intoxication if you’re on the pill.
But alcohol does not interfere with the action of the pill.
But remember that there is no intoxication and 
vomiting after the alcohol
In intoxication, you may might forget to take pill.
If you plan to drink, make sure you’re prepared to take your medicine at the correct time.
If you drink excessively, you may become sick and vomit. If you vomit within two hours of taking your pill, you may not absorb the pill, which could increase your risk of ovulating.
So if you have vomiting after 2 hour of taking pill then use 
barrier contraception for next week.
But I think you have not any vomiting, sickness and missing pill, so no chance of the 
pregnancy.
Hope this may help you
Contact HCM for further health query
Best regards
Dr. Sagar