At 17, I started missing menstrual periods. I was diagnosed with PCOS yet I never had an ultrasound or anything. I was prescribed birth control, which I stopped in February 2012. I did not receive menstrual bleeding until August 1st, which lasted for 19 days (it was more like spotting, filling only 1-2 pads a day). I received a normal period starting on November 5th, lasted for 7 days like the previous years. I started again on March 24th, which lasted 15 days. Again on May 5th, which lasted for 20 days. Again on June 18th, lasted for 19 days. Then on July 12th until now. All the months have been spotting, only having to change 1-3 pads a day. Any idea what could be wrong? I have never been pregnant and the only medication I am taking is citirizine for allergies.