It wont be the utrogestan which has caused the bleed, it doesn't work that quick, with just one tablet! It will be you natural period. If you are having a proper bleed on your own, I would agree with Dotty. Stop and count this day 1 and start again on day 15 with 200mg. You could of course continue with utro orally but trying to use it vaginally I think would defeat the object because it is unlikely to be absorbed if you are bleeding properly.
Like Hurdity I have never had a bleed during my utro days so I cannot advise properly but it seems sensible to say that if your body is shedding the womb lining on its own, it won't need any help until the next cycle - well it makes sense to me...anyone??x