Dr. Uzma Arqam
DIPLOMA IN WOMEN 'S HEALTH FROM ROYAL COLLEGE OF PHYSICIENS IRELAND ., DIPLOMA IN GYNNAE AND OBSTETRICS FROM
Obstetrics And Gynaecology
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As you have described your history that irregular periods are already there. You are a teenager as well could have some irregularities in cycles as the phase of development but continuous irregular cycles need to be investigated actually. Strict diet, strenuous exercise, hormonal imbalance, illness, medications, contraceptives all can delay periods actually. For pregnancy, a single sperm can help to conceive otherwise in case of hormonal imbalance women used to take medications, extra health precautions for years to conceive. So it is luck as well.
For safe side, you can have serum beta hCG (blood pregnancy test) to check your pregnancy status. If it comes negative, then you can have combined oral contraceptive pills cyclically for three months to aid your menstrual imbalance. In case of a negative test of serum beta hCG, you can have a transvaginal scan and on day two periods can have blood tests (serum progesterone, testosterone, insulin, thyroid function test, prolactin), collect all results and can discuss here or with your local gynecologist as per your convenience. Blood pregnancy test will completely guide you correctly.
For more information consult an obstetrician and gynaecologist online --> https://www.icliniq.com/ask-a-doctor-online/obstetrician-and-gynaecologist