Prenatal vitamins

Darcy
I was prescribed prenatal vitamins to help me getting pregnant. I started taking them the second week in September. My husband was gone training for the whole month of September so we didn't have sex. We had sex on the 1st & 2nd of October. I had a period in September but this month I am going on 41 days without a period. I have taken two pregnancy tests both showing negative. Am I having issues with my period due to the vitamins or could I be pregnant and it's just to early to know?