Help!!! TMI!!!

Constance
My period have never really came on time but around my due date and sometimes on my due date never more than a week before or after due date.  But recently my egg whites have been brown!!!! Like really dark brown please someone tell me you know what's happening. I'm terrified to go to the dr for this it's embarrassing I've never had an std or anything wrong down there. I've had the same sexual partner for the last two + years I have two babies two years and one year in age. So it's time for me to have another pap but I'm so scared!!!