Vitamins don't prevent pregnancy.
Prenatal vitamins are to make sure you have enough vitamins and minerals to support a pregnancy. Birth control is to prevent pregnancy. They have different purposes. Birth control does not support a pregnancy, and prenatal vitamins do not prevent pregnancy.
no it can't prevent pregnancy
No prenatal vitamins do not cause you to miss your period - they are vitamins, thus have no influence on your menstrual cycle. Consider that if prenatal vitamins did cause you to miss your period (which would only happen if you missed ovulation) then they would prevent pregnancy, this work against those who were taking them!
BV won't prevent pregnancy.
Lithium does NOT prevent pregnancy.
NO ! ONLY contraception or abstinence can prevent pregnancy !
Starch as in pasta, potatoes etc? That does not prevent pregnancy.
No. Cytotec can be used for abortion but not to prevent pregnancy.
You mean vitamins? There are prenatal vitamins you should take during pregnancy. Speak to your doctor.
During pregnancy, you need the same vitamins (and minerals) as at other times: those found in multivitamin tablets. However, the amounts of some vitamins that you need change with pregnancy, so you should definitely consult your doctor.
Yaz is a birth control pill. It is intended to prevent pregnancy.