I rang clinic this morning and the nurse said that it is totally normal and not to worry- maybe a bit of fluid just coming out. I'm in for a scan tomorrow morning so maybe they can shed more light on it. Lower abdomen feels quite tingly at the moment and a little crampy. The nurse said this is a good sign. She said that PCO can go one way or the other: either respond really quickly or really slowly. She reckons I'm responding quickly.
Oooo can't wait for scan tomorrow - I need another update!