The last period I had was during the week of Thanksgiving. I've seen a hint of what looks like my period may start, but then nothing else happens. I've taken a few pregnancy tests and they all came out not pregnant. What is going on? Could it be stress? I just moved and got a new job, so maybe it's stress. But I would think that if I were pregnant, it would show up after 2 months of no periods. I just don't know what to think. By the way I'm 31 years old, if that matters.