Can prenatal vitamins delay period?

Gwen • Had my sweet rainbow baby girl on April 3, 2017! 👶🏻🚼🍼 So incredibly blessed. ❤️
Can they delay your period and once your period finally starts can it make it a long one? I started taking them last month and this month I was a week late for my period and my period is still going strong and it's been 9 days.