Usually, HPT becomes positive within a week of the missed period. Blood tests can give you even an earlier diagnosis. You may repeat the test after another week or go for a blood test. HPT are not sensitive in detecting low hCG
levels as sometimes seen in early pregnancy
. If you did not miss any pills in your last cycle, chances of pregnancy are less. Take an opinion from a gynecologist after an examination to exclude pregnancy if you should continue with your pills. Take care.