Hi, came off the pill in mid nov '13, had 1st real period 1st january '14, 5 period cycles since; last 2 cycles 15/16 days apart. need 2 see gp quick?

Breakthrough: This sounds like a hormone imbalance or breakthrough bleeding. Sometimes this occurs because estrogen and Progesterone (your 2 female hormones produced in ovary) are not in the right balance to each other. Sometimes it's due to pituitary or thyroid issues. And lasly, sometimes due to weight (too thin/heavy). If bothers you can consider birth control pills to help regulate. Best of luck.