I am taking Ortho Tri-Cyclen Lo and have been on it for 5 months, my periods are always on time (even off the pill) but this time I am 10-14 days early, and last month (2 weeks ago) I was 3 days late. Is this normal or could there be something wrong. I have missed a couple pills in the past month but have taken them the next day. I also have a history of HPV (cyro and clear for 2 years now) and yeast infections.