Birth Control - I was wondering that I am on the microgestin I would like to know if I would get?

Birth Control pills (and nuvaring) work 3 ways. They prevent ovulation. They decrease the lining of the uterus, and they thicken the mucous at the cervix.
This means that if you take your pill every day at roughly the same time, you will not get pregnant. There are some medications that decrease the ability of the pill to work. One of them is antibiotics, so that if you’re on them you should use a backup method of birth control.
You will not get pregnant when you are on the inactive pills. YOU DO NOT OVULATE WHEN ON THE PILL.
You may have a very light or even no period from time to time because of the decrease in uterine lining.
You do not ever need to take plan B. The only reason for condoms when on the pills is to prevent STDS.
If you forget a pill your chances of getting pregnant increase slightly. The more pills your forget, the more your chance of pregnancy.
When first starting the pill you need to use back up birth control for at least the first week. After you start the pill, when you have your period has nothing to do with taking the pill. You just keep taking them one pack after the other. You do not stop them if you start spotting, you do not stop them if you don’t have a period, bleeding has nothing at all to do with when you take your pills, once you’ve started them.
as far as him ejaculating in you, this is not a method of birth control anyway, so it isn't even a consideration at anytime.

As long as you have been on them at least one cycle and taking them on a daily basis with no misses then you are protected against pregnancy and your partner can ejaculate inside you without getting you pregnant. The pill keeps you from getting pregnant at any time in your cycle, even on the inactive pills. If you miss one pill or more, you need to use condoms as back up. Withdrawing the penis before ejaculation is not safe enough since sperm can be released all throughout the sex act not just at ejaculation and the male cannot control this secretion of sperm before ejaculation. You can still get pregnant even if he withdraws before ejaculation (cumming). The pill protects against pregnancy but doesnt protect against STDs. If you are in a commited relationship and you know your partner is free from infection then you no longer have to use condoms, if that is your choice, unless you miss pills then you need to abstain or use condoms again for a week after the missed pill.