I have no idea of my cycles and they're all over the place, so can't just wait until I know AF is due. Have started poas-ing because I felt pregnant and now can't stop but it's costing a bloody fortune. I've got one left in a pack I'll use in the morning but then I'm stopping until... when? Next week? Next month? If and when I actually randomly throw up in my handbag, as per the movies? I need some kind of system!