Thanks for the query.
As you stopped the pill there is possibility of pregnancy if you had unprotected intercourse
around the time of ovulation.
Sometimes urine pregnancy test kits may not detect early pregnancy and also they can give false positives and false negatives.
So you better go for blood test
for pregnancy which can give more accurate result and if the test comes positive once undergo ultrasound
to locate the gestational sac
and then proceed according to your doctor's advice.