Late Period

I've had my period for 10 years now, its been so regular, my doctor questioned if my mom and I were telling the truth or not. It's always between 28-33 days long, and a 3 day period. I'm now on my 16th day with no period and 5 negative pregnancy tests. It isn't stressed related, because I've been less stressed now than I have been in 3 years. The kicker is that my father forgot to tell me I'm no longer on his insurance and I missed both my work places deadlines. I just want a yes or no if I'm pregnant or what's going on with my body. . .