Hi there, Don't take tension. Kabhi kabhi problems ho jaati hai menses ki. If it's first time nothing to worry much. Do pregnancy test if you are sexually active. Eat healthy Do exercise . You have mentioned tAb registering. If you have already taken the medication then just wait for the menses. And maintain menstrual calender. Lifestyle changes, stress, lack of physical activity can cause menstrual problems।

Nothing to worry sometimes it happens, wait 3to 10 days your periods will come.avoid stress.

Hi. Please  chek  your preg test if you are sexually active . If not then start doing sone excercise for 30 min daily . Stress and lack of physical activity can cause the problem .

U have to get a complete USG and hormonal check up with ur doctor, if everything is normal then u need not worry , but u have to rule out pcos and everything