On 20th June 2016 i started using a birth control pill (nordette) on the first day on of my cycle. I stopped taking it after 18 days (on 7th July) because of some side effects. On the 13th july i started having withdrawal bleed/period which lasted for 4 days. 5 days after the last day of period i noticed very light pinkish apotting which lasted a few hours to a day. My cycle is always a 26-28 days cycle where period last for 4 days. Now my period is 6 days late. Ive been experiencing abdominal and lower back cramps for a week like im about to get my period but still no period. I dont have any pregnancy symptoms except feeling sleepy most of the time. Im now on 5th week after my last birth control pill. What could be wrong with me? I havent done any pregnancy test .