According to your age, you could have entered the peri-menopausal stage. It is common for menstrual disturbances to be seen and can vary from delayed or early periods to metropathic cycles. If you do not use any contraception
and are sexually active, it is also possible for conception to occur as you have difficulty predicting ovulation
. I would ask you to get a pregnancy
test along with a trans-vaginal sonogram. Your routine gynecologist check up should also include a pap smear
apart from checking for local causes. Hope this helps.