Input?

I have had an irregular period ever since I started getting my period. I could wait anywhere from a month after my last period to up to six months for my next one, possibly even longer. They were so irregular I didn't even keep track. And they were also very light. I just started birth control and I'm still on my first pack. I missed a pill one day and did double up the next day to make up for it, but the next day i got my period and I was like only almost half way through the pack- In other words, I wasn't to the off colored line yet, which apparently is the time around when your period is supposed to start. But my real question lies here.. I started my period that day, and I'm on day 15 still going strong, and am now about halfway through the last week on the pack of pills. Has anyone else had a similar experience and fuck.. how long until I get some relief and it ends?