In general, home pregnancy
test or blood test
for beta-HCG gives accurate result after 7 days of missed period. Early pregnancy test may give false negative result. So, you can repeat those tests.
In exclusion of pregnancy, other reasons are ovarian cyst
, hormonal imbalance, stress/anxiety, thyroid problem, weight gain/ extreme loss, irregular eating habits, psychological factor etc.
Need to investigate properly to pin point the diagnosis by USG lower abdomen, complete hormone assay, thyroid profile, blood sugar & prolactin
level. Consult with your gynecologist for proper guidance. You may need to take hormonal medication with other supportive therapy.
Avoid stress/ tension, take healthy diet with Vitamin & iron supplements
, control body wt by regular physical exercise and take sound sleep.