I'm usually on a 28-30 day routine for my period. Although I've been off of my birth control, and my husband and I have been TTC for about 3-4 months now, my period has been on time. I was supposed to start this past Friday, October 23, but have not. I took a pregnancy test Saturday morning, and this morning as well, both are negative. What's the deal?!  I do work with my primary care physician, should I get a hcg blood work drawn? Any ideas, suggestions?