Hi Joyshree, 

please Rule out pregnancy first by doing home Urine pregnancy test. It is not possible to prescribe on the online platform. 

Hi, 

initial periods after menarche tend to be irregular due to ovulation issues. you may visit  your gynecologist. 

Hi, 

First you should do urine pregnancy test first to rule out pregnancy. 
If you want to discuss further, I will be available on this link between 10:30 AM - 11:30 AM and 4 PM - 5 PM - http://bit.ly/3VAi5Vp5