I have an irregular period and had not had one in three months. I went to the doctor, was put on yasmin, and the first day I started the pill, I started my period. I continued to stay on the pill since I'd already started the pack. It stopped after 9 days(unusually long) and I have been spotting ever since. Will it correct itself the next time I have a "normal on time" period, or should I be concerned?