Pregnant??

I have a question...we have been TTC for 9 months now. My typical cycle since going off BC has been between 25-27 days. It is 28 days today, no period yet, and when I tested this morning, it as negative-not even a faint line-do you think since I haven't gone this long cycle wise that I might be pregnant & it's just not showing up yet? Any help would be greatly appreciated!!!!!!