Yes, no Birth Control is 100% affective.
not affective at all.
Abstinence then IUD.
Birth control vaccines don't exist, but you can get birth control shots.
99.9% effective
No it does not.
in your arm eaither one.
Birth control shots cannot cause falsely positive pregnancy tests. Pregnancy tests measure hCG (human corionic gonatotropin). Birth control shots contain entirely different hormones.
The ONLY birth control that is 100% affective is abstinece. But, if you get on a pill, shot, or IUD AND use condoms, you are much less likely to become pregnant. There are several different ways to avoid it.
Birth control pills increase the risk for blood clots. If you already have blood clots, birth control pills could make the clots worse. There are other birth control methods which could be good alternatives, condoms, diaphragms, shots, and IUDs.
Do you mean how easily can you become impregnated? Very easily. I did not use protection one time with my fiance and I became pregnant.
The only birth control that is 100% effective is abstinence. Effectiveness of birth control really depends on the person. Some options may be pills, patches, shots, rings, condoms and surgery. The best advice is to visit your doctor and have the doctor help you decide.