I've been on oestrogen patches for only 9 days, I'm wearing the third patch now, and my boobs have already started to grow!

I'm also on decapeptyl for 2 months and 9 days, got my third injection 9 days ago. I don't think decapeptyl is commonly used? Besides the decapeptyl and the patches I don't use anything else. Normally people get androcur here, but this is for medical research. The decapeptyl is very expensive so they normally don't use that, only as puberty blocker for adolescent transgenders.
I never expected to see any results so soon so I'm very happy. It feels kinda great. My small boobs are defenately already visible in my shirt. I don't feel any small knobs behind the nipple yet (I was told that I would get those at some point), but the tissue has defenately grown already. Let's say that my 'breasts' are a handful now. Left is a bit more than right. It's hard to believe in such a short time. It aches a little but it's not really bothering me. It's the same feeling as muscle ache, so to have that feeling in my breast area is kinda strange.
Is it normal to have these results so soon? Is it a good sign? Does it say anything at all about how big my boobs can grow?
What can I expect next? The small knobs behind the nipple?