Hi, so I take Ortho Tricyclen lo, I've been on it for about two years now. In the month of December I missed a few pulls, about 2-3, and my period is 5 days late when it is normally always early or on time. At most, it's been a day late. I was due for my period on the 20th. I took two pregnancy tests on the 21st that read negative, but my period has yet to show up. What should I do?