pre natal vitamin's cause pregnancy like symptoms?

[daughter of rock]

i think i might be pregnant and i have been taking prenatal vitamins for 3 months now try to prepare my body but my friend told me that the vitamins could be causing my symptoms is this true because i thought there weren't any hormones in them isn't that what causes the symptoms? course of action if we are thanks
id really like to know so that my husband and i can start planing a
i have breast tenderness sleepiness and back ache also i want lots of salt for some reason