Hi

I have been on Ortho Tricyclen 21 for over 3 years and my menstrual cycle has been like clockwork every single month, until today. I have 1 more pill to take before this month's pack is finished and then I expected my cycle to begin on Thursday, as has been the norm for me, then I begin my next pack on Monday.
So I took a pregnancy test this afternoon and it came up negative....am I too early testing, are these pills no longer right for my hormone levels or can I be pregnant? Are there any uterine illnesses I should be aware of that would fit this situation?

I am worried...what's normal for me has been shattered!