Hello, I would be happy to help you with your question.
In many cases the pill can be used to delay your period. But this does not always work. It might be the case that you are ovulating on occasion even though you are on the pill. This is especially the case with low-low dose pills. It is unlikely to conceive during your period or right as it is ending, so I think that the chance of pregnancy
is extremely low. Check the test again in 1 and 2 weeks and talk with your doctor about a higher dose pill.
I hope that this helps. If you have more questions, please click on "ASK ME A QUESTION" link above to directly ask me a question!