I am not a trans woman but I was hoping I could chip in with a bit about Finasteride as I used to be on it.
Finasteride is not a general anti androgen, but it does block DHT, which is what some T gets converted to and is the most potent/effective form of T. I’m a guy and I was briefly on it for hair loss but I stopped because it made me depressed (dysphoria) and I also felt a little weaker. So at least from my experience, I would call it an anti-androgen, even if it works specifically against DHT.
One side effect of finasteride reported by some men taking it is breast development, so I would be very surprised if it has anything to do with what you are noticing with your chest.
Have you had a blood test recently? If that’s all good, breast growth can take a long time (several years), and ofc the full extent of it varies from person to person.
This is rude. You can say you don’t like it without calling how a lot of people look naturally disgusting.