It is possible.
Spermicidal cream is a contraceptive substance that destroys sperm, inserted vaginally prior to intercourse to prevent pregnancy.
The semen is inserted into the female by the erect penis of a male during the act of intercourse.
Through intercourse or any way semen is inserted into the vagina, just like adults. If she is ovulating that is, otherwise she cannot get pregnant. A pregnancy for a 11yo would be dangerous for both her and the baby though and having sex with a 11yo is illegal.
If you had intercourse, that is a penis was inserted into the vagina and the male ejaculated you can get pregnant. The odds are you will not, but it's like rolling the dice, you can get pregnant. If he is honest and aware of his body he can tell you if he did ejaculate. Or you could tell all by yourself in most cases, if you were much more wet than usual when he finished. Get pregnancy tested anyway.
Generally the IUD (a device inserted into the uterus to prevent pregnancy) is very safe. You should not have to worry about a big penis hurting it or bumping into it. However, if you experience unusual pain or bleeding after sexual intercourse, it is always wise to see a doctor.
Birth control pills work to prevent ovulation, an inserted ring prevents an egg from attaching to the uterine lining and a female condom traps sperm so that it can not reach the egg to fertilize it. An ablation is the burning of the uterine lining so that pregnancy can not happen even if an egg is fertilized.
In our case, the pharmacist made some estrogen suppositories that were inserted in the birth canal at certain regular times. This made the ovulation period much more dependable and healthy. Pregnancy followed.
This is necessary because it makes it easier for the penis to be inserted into a female vagina during sexual intercourse.
Regardless of how fresh semen is inserted into the vagina you risk pregnancy. Even with a hand.
Sitting down does not make it work any differently, you can sit down if you would like though. Just make sure it is inserted very deep so that it is not ejected accidentally.
It is called an IUD.
If the brand is "Today" the sponge needs to run under water until thoroughly wet before inserted. Other brands are Protectaid and Pharmatex and come ready to use. The sponge can be inserted up to 24 hours before intercourse, over the cervix (beginning of the uterus). It must be left in place for at least six hours after the last time you have intercourse. It should not be worn for more than 30 hours in a row. Note that contraceptive sponges do not protect against STD's and are only 75 to 99% effective in preventing pregnancy. It is wise to use the sponge accompanied by a condom or the pill.