Hi goodstuff,
wow you sure do have some tricky questions, and I will do my best to try to answer them for you, but it will be much more helpful to you once the other girls here answer them aswell, not only do they give great advice but it helps to have many opinions.
1. The fact that you masturbate once a day will not reduce your chances of getting a girl pregnant. When you think of people who are trying to become pregnant, the more sex they have each day, the better their chances are of concieving. Therefore the sperm count is obviously not reduced enough to minimize pregnancy.
2. It doesn't matter whether or not the sperm was alive the second time you had sex, as you had sex twice without a condom for the first 3 minutes. Seeings as you masturbate everyday, you probably would have noticed that semen seeps from the tip of the penis even before ejaculation. That semen contains sperm aswell. Therefore you do not need to ejaculate inside your partner for her to become pregnant, you only need to be inside her.
3. Her odds of becoming pregnant are very high on the 12th day, as around the 14th day is what we usually consider to be the typical time of ovulation. Therefore her body may have already released an egg when you had sex.
4. Alcohol can cause many complications in pregnancy, and it certainly does effect the fetus. It might be a good idea if your girlfriend doesn't drink any alcohol until she has taken a pregnancy test and knows for sure she isn't pregnant. The first 12 weeks of pregnancy are the most important, and miscarriage is a very real possibility.
Good luck...
Suzy