a big fat goose egg! I do not keep them on hand. no need to LOL, i'm the responsible one out of me and JJ so i have no need to worry. I bought some, a grand total of 4, when i thought i was pregnant with riley, a 2 pack of +/- and since they didn't turn out to be fully readable, and a 2 pack of digis. I won't buy any this month until after we get back from Cali next week, so it'll probably be around the 15th and i won't be able to test until the end of the month. I know, way to be a pee stick spoil sport