Answering your questions:
1) I ejaculated inside my girlfriend with a condom. Can she be pregnant?
The condom is waterproof and effective to prevent against pregnancy and sexually transmitted diseases.
If it does not burst and is put in the correct way, the probability of the woman becoming pregnant is only 2%.
2) Taking the penis at the time of ejaculation is safer to avoid a pregnancy?
If you have a condom, it makes no difference, as was answered in Question 1.
However, if you do not use a condom and take your penis out when you ejaculate, chances are you will get pregnant. The so-called interrupted intercourse is not a safe way to prevent pregnancy. For this, you should always use a condom or use another really safe contraceptive method, such as the pill, the IUD, etc.
3) If the condom does not burst and is whole at the end of the relationship, are there risks of getting pregnant?
Since used correctly, the condom has a 98% effectiveness in preventing pregnancy. If the condom does not burst during intercourse and is used correctly, there is a 2% chance a pregnancy will occur.
Learn more at: Relationship to Condom What Probability Does Pregnancy Occur?
4) Is it normal for the condom not to be the same as it was placed before the relationship?
Yes, with the movements during the sex act, the condom is not exactly in the same position as it was placed at the beginning of the relationship. It is advisable during the relationship to check that it is still well placed and not bursting.
5) Which contraceptive can my girlfriend take at age 14?
There are several hormonal low-dose contraceptives that can be used by teenage girls. It is best to seek the gynecologist, family doctor or general practitioner for an appointment and indicate the best contraceptive method and the best pill to use in this case.
You may also be interested in:
Unprotected sexual intercourse: what are the risks?
Relationship with Condom