I am a 15 year old girl. 2 years back I got my 1st peroods...
After that I don't get periods every month. Instead I get every alternate month & according to me it bleeds very less... what to do?

Usually the first few years, Your period will be irregular.
I got mine when I was 10 and it did not become regular until about or 12 or 13.

But I would advise you to seek a doctor or gyno if you are sexually active...
It could be an hormonal imbalance, stress, or a problem with your pelvic.

I would go to the doctor just to be on the safe side.

That's normal but it never hurts to check it out