Birth Control- Skipping Period

Patient: I’ve been on tri cyclen birth control for about 1.5 years and have never skipped my period until now. I took 2 packages in a row in order to skip my period this month. I am on my 8th day of my second package and seemed to have started my period. Also, I forgot to take one pill 3 nights ago. Is this my period and how long will it last?

Symptoms: Cramps, blood clots, normal flow