welcome to healthcare magic
i would suggest that get a pregnancy
test done to be sure that you are not pregnant.
you also need to rule out ectopic pregnancy as well
if above are negative then you need to be investigated for dysfunctional uterine bleeding
causes like taking family planning pills, thyroid
problem, ovarian problems etc.
would suggest you visit a gynecologist for review if pregnancy test turns out to be negative
hope to have answered your query