Period Help

I'm going to start this by saying I am calling for an appointment with an obgyn tomorrow. My old one moved so I needed to find one first, but here is my issue:
My period has been extremely out of wack. I missed my period in November, had my period in December, missed my period in January, and then February I had 2 periods, had a period already in March, and started bleeding again today, I just finished the last one on Saturday.  Has anyone experienced anything like this?
I am on birth control, lo-loestrin 24, and I am married and sexually active. I am just wondering for any ideas as to what could be causing the irregularity. Nothing really has changed recently and I was regular before! Thank you!