It has been 45-50 days since my last menstrual cycle , is it normal because i always have it late but not that late , if its not what ihav then?

Pregnancy or other: If you have essentially "skipped" a period, then a pregnancy test must be checked first. If this is negative, then the explanation is likely absent or irregular ovulation. This is very common in young women. After testing for thyroid disease and elevation of a hormone called prolactin, talk with your doctor about birth contol pills.