 [ Symptoms ] prenatal vitamin or multivitamin  i am not pregnant yet should i take an over the counter prenatal vitamin or a multivitamin with folic acid and prenatal vitamin listed on the back three months before trying to conceive [ Disease ] the tampon will over no protection against pregnancy but your menstrual cycle most likely will assuming this is a normal period you are not ovulating so the chance of an unintentional pregnancy is very low