I've been taking Caltrate Vitamin D for about a month every day, and this is the first time that my period has become so different I usually have it for about 3 to 4 days its going on 2 weeks and in the begining it was very dark, no clogs thu. So I am wondering if me taking this vitamins has effected me in this way. because there is nothing else different that I am doing like diets, stress etc.