Very irregular periods?

For sure you'll want to bring this up the next time you have your female exam. I too have had very irregular periods my whole adult life and I found the pill to be a very good way to control it. Ask your doctor about going on a three month plan, where you only have your period four times a year... it's SO much more convienvent. Your body may still be underweight and your eating habits still not good. The body knows when it's capable of convieving and if red flags are going up that you don't have the proper fat content or that your diet is bad, you simply may not have a cycle. BMI sites I was putting your height and weight into were saying you were around a 18.2 and they consider anything under 18.5 to be underweight.