Can prenatals stop periods?

I’ve had thin milky (same scent I get during peak ovu time) CM on and off for a month now. I’ve only ever seen a much lighter and thicker version of this once in a great while for a day or 2 in the days before my period. So this is new for me but idk if pre-Natals are causing it and if they stopped my period. may be a stupid question but seems more possible than being pregnant. I’m bout to miss my period for the 2nd time assuming it doesn’t come late.