Help!

My husband & I have been TTC since October 2014. The first day of my last period was on January 10, 2015. I've taken numerous pregnancy tests & they all say negative. I've gone & done a a blood test to check for pregnancy & that came out negative as well. I still haven't gotten my period. What do you think it could be? Is there a possibility that I'm pregnant? I'm so frustrated & confused.