My friend has PCOS and had a lot of bleeding in peri so had the mirena coil fitted which helped.I don't think so, although it's a few years since I last had an internal ultrasound, but everything was ok, other than PCOS.
My smears are always fine so I don't think there's anything sinister to worry about there either.
It does seemed to have calmed down again this evening to a very light spotting so I'm going to just keep an eye on it for now.