Because your body was responding to something new.
I had the same experience. Started with a little growth at about three months. After that, the growth continued, but I couldn't see it or even measure it. That was because the glands deep in the fatty tissue were developing. At two years, I was very frustrated. The only real evidence I could point to was that my hormone levels were still not within the proper range.
I argued with my Endocrinologist constantly. I read studies, did my own research, and came back to her with a stack of papers for her to read. My GP (with 40 years' experience in Family Medicine) suggested that I might be a fast metabolizer. For some medications, my body processes and eliminates them very quickly. They can't do their job if they are not in the bloodstream.
We had already switched from pills to patches because the pills were not raising my levels enough. They kept increasing my dose and I was wearing three patches at a time and changing the weekly patches twice a week to compensate.
We changed the T-blockers from Spiro and Finasteride to leuprolide and bicalutamide. It seemed the higher T levels were competing and keeping my E from getting where it needed to be. It wasn't enough.
That was when we switched to injectables. After six months on Leuprolide and bical, plus injectable E, the tables turned. T was suppressed, and my E levels moved up where they needed to be. After a year of T-levels <12 on my labs, it appeared the E was suppressing the T, so I stopped the leuprolide and bicalutamide.
I have been on injectables for a little over two years with my T fully suppressed and E levels where they need to be. In the past six months, my breasts have again started to grow. Not quickly, barely measurable. But the growth is there.
Hormones are very complex substances, so adding one affects all the others. The body responds to changes. Over time, the body learns that this is the new "normal," so changes slow down a little. They are still happening, just not dramatically so. Teenage girls seem to grow breasts very quickly and within a few years suddenly have hips and soft skin too. After that, their changes tend to slow down, but they don't stop. Eventually, they reach the point their genetics say they should, and it becomes maintenance after that.
I hope this helps you understand a little better why things happen at the rate they do. Every body is different, from genetics to metabolism, and even sensitivity to various substances (not just hormones). I kept logs of my measurements, weight, lab results, and dosages. That helped me track what worked and what didn't. I know you don't have access to the medical care as I do, so it is even more important to pay attention to what is really happening.
Don't get frustrated (although I know that is very hard), but try to figure out what is going on. Are your T-levels too high? E levels should be ok now. Once everything is set, maintain it for three months, then check again. Adjust as needed, then wait another three months to see what changed. If you make changes too quickly, your body can't figure out what it is supposed to be doing. Just relax and let it happen.
