Mazal tov on your upcoming wedding!
This close to your wedding, going on combination contraceptive pills is likely to lead to bleeding. However, there is another option. Please consult with your physician about using progesterone pills to push off your period the cycle of your wedding. You would continue taking these pills until you have relations the first time and become niddah due to dam betulim. In this way, you will start bleeding a few days later and the time of niddah from dam betulim and from your period should overlap.
It may help to refer your physician to the articles “Hormonal Cycle Manipulation” and “Hormonal Cycle Manipulation for Brides” in the section of our website designed for medical professionals, Jewish Women’s Health. You can print the articles from the site to show to him/her directly.
Please note that not all staining makes a woman niddah or invalidates her clean days. Now is a good time to review our article on staining, “Ketamim“, for more information.