If you have always had regular 28-30 day cycles, it is time to get an estimation of serum beta-hCG
done, since you may not be able to get a definite conclusion with a HPT, having performed it already. You should see an expert for a physical exam and get a trans-vaginal sonogram for clarification of the situation. Also, you can expect withdrawal bleeding to commence 3-7 days after completion of the treatment course. So, if this has not occurred proceed as above. Hope this helps.