Could I Be Pregnant?

I always have a reliable regular cycle. Even when I got off of my birth control in Janurary, I have had a 28 or 29 day cycle and have only missed a period once in my life. My husband and I have been TTC for 3 months. I am now 31 days into my cycle and have not started my period. I took a pregnancy test at day 29 And again this morning (first thing) and both were negative. I have yet to start my period. I feel like I'm a little more tired than usual and have been having some mild cramping off and on, but am thinking I could be imagining it. Any thoughts l? Could I still be pregnant? What should my next steps be?