It is also possible to get pregnant after drinking alcohol and having sex if it happens to coincide with ovulation. Alcohol is not a contraceptive, it does not affect pregnancy, but getting pregnant after being drunk may cause deformities in the baby, so it is best not to drink alcohol during preparation. Drinking alcohol does not affect the meeting of sperm and egg, and there are still many cases of unwanted pregnancy after drinking alcohol. To determine whether or not you are pregnant after drinking, you can project your ovulation period based on your menstrual period. Generally, ovulation occurs about 14 days before your period, and there is a high chance of getting pregnant if you have intercourse around the time of ovulation. The most accurate way is to go to the hospital for a blood test when you don’t have your period, which is the gold standard for diagnosing pregnancy.