Hi belle
I've had spotting and bleeding a couple of times when I've forgotten to take the Utrogestan. The first time it happened I had a hysteroscopy, and they said that I the lining was very thin , and I in fact had endometrial atrophy, which caused some raw spots. They said that likely, the fluctuations caused instability in the lining, and caused the bleeding.
So it is possible to have bleeding with a thin lining, and missing just one utrogestan can destabilise.
Maybe try the conti again?
Jeepers xx
Jeepers xx