I am 21 years old. for the last 2 months i had menses after 19 days and 23 days. is it normal?.. please help..

Irregular periods: This is not necessarily normal, especially if your periods used to be very regular. Consulting with your ob/gyn would be helpful as they could do an ultrasound to look at your uterus to rule out a potential reason for this irregular bleeding. In addition to the ultrasound, they will probably draw blood to rule out some hormonal abnormalities that can lead to irregular bleeding.