This month my periods is not start... what can I do fr that...

There's so many things that can cause missed or late periods its impossible to tell you why you're period is not starting this month over the internet.

Are you sexually active? Is pregnancy a possibility for you? Have you been stressed? Have their been any changes to your diet? Or changes in exercise?

Those are just a few common reasons for late/missed periods. But like I said, it's impossible for anyone online to tell you why you're period hasn't started yet. If this is something that has you worried you need to call your doctor and go in for a visit.