I'm 19 years old and I started my period when I was 12. Ever since I first got it it has been regular, coming every 30-33 days. In April I missed my first period ever. Then in May I got a "brown period", about 2 weeks after my missed one, then a normal one that came on time. I did not have a period in June, so I was expecting the same thing to happen in July, 2 periods in one month. But, July is basically over and I haven't had any periods. Do you know what you possibly be wrong?