My husband and I have been trying to conceive for the past few months. My cycles have been 29 days long. The last time we tried was in January. I did have my period on January 27th, normal in lenght, right time, it wasn't anything like implantation bleeding (I already have a son). We didn't try in February (no sex), and I was expecting my period on February 25th. Now it's March 2nd, and still no sign of period. I did a HPT yesterday (March 1st), and it was negative. Even after all that, can I still be pregnant? What might be happening?