你 should consult a doctor. (S)he'll ask 你 relevant questions, and will be able to clear things up. Not getting your period for a couple months is quite commonplace as far as the people I know go. However, one of my 老友记 didn't get it for quite some time, and she had some sort of hormonal imbalance. Another friend of mine was diagnosed with
link. Don't panic though. I'm not giving 你 examples to scare you. Only so that 你 see the importance of consulting a doctor. And really, don't freak out. Keep calm and... visit the gynec.