I need some advice.

I'm in my early 20s. And I'm not on any birth control. My husband and I had sex around the 10th of this month. My period was suppose to start the 17th and now it is the 29th and still no period. I've taken a pregnancy test and it was negitave.. Could I be pregnant but it's to early for a test to read or what do you ladies think I should do? Or think?