coming off the pill

So, I just recently decided to go off of the pill. I have been on it for 9 years, and there was a few reasons as to why I wanted to come off. But it's been two months now, I've had two regular periods. But now, I'm two weeks late. I'm starting to get pretty nervous.. I took a pregnancy test three weeks ago because I was feeling nauseous, but it came back negative. Could it be just because I was on the pill for so long, and coming off of it made me miss? Or could I potentially be pregnant? Help!