Do prenatal vitamins affect your cycle?

This is my first month trying and my first month taking he vitamins and I'm not getting my period but also not getting a postive pregnancy test. I'm currently 10 or 11 dpo and 5 days late on my period. I am never this late. Do prenatals affect the length of your cycle? My cycles are never longer than 32 days and I'm in cycle day 36.