(( VaginaPagina ))

If you've been taking the pill erratically, that is entirely likely to be confusing your body -- and/or allowing other people's pheromones to influence you, since the ovaries aren't under a constant stream of hypnosis! (Sounds like you're actually a pheromone responder, really! Maybe something in the scent of uterine blood?)

I hope that everything sorts out when you've got the IUD in!