When I thought I had early menopause it turned out to be endometrial hyperplasia, and they also thought I may have had cancer. I didn't/ don't have cancer, but it is a good idea to check with a medical professional just in case.
It depends on your age.
With being on the menopause, you can experience other symptoms like mood swings, hot flushes and severe sweating at night time. Periods can still come and go and be very erratic as well as being either heavy or light.. The menopausal symptoms can go on for many years. Once periods cease completely and do not return within 2-3 years you will know that you have completed that stage of your life.
Missing only 3 menstrual cycles is not a good indicator to be certain that you are menopausal. If you are sexually active, it may be a pregnancy. It can also be from low iron levels or other hormonal, ovary (polycystic ovaries) and uterus issues.
Your doctor can take a blood test to find our your hormone levels, and depending on your age will let you know whether you are menopausal or not.
If you are sexually active, still take precautions. Missing periods, does guarantee a non-pregnancy.
If you experience the symptoms that I mentioned earlier and if these are severe that you are not able to cope with it, your doctor can prescribe HRT for you if you are menopausal. It is up to you whether to take the HRT, but you will find that having a good healthy and well balanced diet with lots of fresh fruit vegetables, cutting out sugary, processed foods and fizzy drinks can help.
Eating wholemeal foods is better than the processed ones like white rice, pasta and white bread. Cut down on coffee and tea, alcohol and fizzy drinks. Drink more water. 2 litres are day is usually recommended, but more if you sweat a lot.
You can purchase a blend of vitamins and minerals for women who are menopausal. You can get these from large supermarkets and also from the herbal shop. The pharmacist may sell them.
Keep logging your menstrual cycle and how it is when you do get one. Log your moods, headaches and any food cravings and hot sweats.
Make an appointment to see your doctor to get your blood checked for low iron levels and your hormone levels. Your doctor may also decide to send you for an ultrasound scan to make sure there are no problems with your ovaries.
Best wishes
Have your periods been pretty regular until recently? If so and you are of perimenopausal age (usually 40's) then this could very well be the start of perimenopause (the transition into menopause) which can last a number of years.
If you are not "of age" then an endocrine or metabolic abnormality could be to blame such as thyroid, pituitary, Polycystic Ovarian Syndrome (PCOS), etc.