Irregular period, how to regulate it?

ok my period is really irregular and I havent had it in like 4 or 5 weeks now. is there anything I can do to make it start coming regular again?

Info:
http://women.webmd.com/features/when-your-period-signals-problem

nothing but take birth control...so many things can interrupt your period and mess with the regularity. Stress, weight fluctuations, diet, exercise, sleep patterns...It sucks being a girl. It'll come when it wants to. But if it doesn't for more than 2 months, go to a doctor. Good luck and be safe

I agree with what cutiepie88 said. If you just started, it wont be a steady flow or anything like that and, if you have had sex, then, well, you may be pregant but just give it a bit more time and if not then talk to a doctor about it.