so every month you hope, you wonder, you think, "will this month be it?" and then on day 28 your period arrives to put you out of your misery, and to save you the 8 quid you might possibly have spent on a test otherwise.
but then every so often, once a year maybe, you pass that 28 day mark, then 29, then 30, and then you start to wonder, "maybe it really will be it this month!"
but you know you shouldn't buy a test, because you know that as soon as you do your period will be there. but hey it's only 8 quid so you buy one anyway.