I am 18 years old. In May 2017 I had unprotected sex and immediately took an Ipill the next day. I got my periods on the exact day I was supposed to, i.e, 17th may. But that period lasted for about 12 days, that was much longer than my usual cycle. The next month's period, I got on June 29th, that was later than usual, but that lasted for 5 days. It's 6th August and I haven't yet got my periods. I even did a home pregnancy test, it came negative. It's been 38 days now. And I ideally have a 33 day cycle. I'm really worried. Please help me doctor.