Because there's a shortage of patches Pinkamanda, the doctor probably thinks you'd be better on the tablets. If I were you, I'd just stop the patches, leave it for a couple days then start the Femoston. I think some would just switch straight away, but if your bleeding at the wrong time, I think she should've investigated more as to why...
Could you go back and ask if you need to have a scan? It's pretty straight forward, and would put your mind at rest. Then you could ask if it's ok to just switch hrt straight away.
Maybe she's thinking the higher dose Femoston will stop the bleeding?
Let us know how your getting on...xx