M.L.
I buy the package with two tests in it... then I force myself to wait a few days to take the first one.. and if it is negative, than I take the other in a week or two, that way I get the test out of the way, knowing I have a back-up if I tested too early. It is best to wait until you have a missed period, but than again, everyone is different, especially if you are having routine periods due to bc. Good luck!