Thanks for choosing HCM.
You have to repeat the Urine HCG test after 2 weeks of the first you did.[However there is no likelyhood of pregnancy
as per your statement.]
If that is negative then a pelvic Ultra sound
scan may be done to rule out other causes of delay in menstration.Heavy periods
in the previous cycles can lead to anemia
which can delay the periods.
You may have delayed periods when under too much stress which is physiological.