spoiler
Congrats on the changes! You might be able to hide it a bit with just a snug undershirt+looser overshirt. But eventually proper support becomes helpful so you can run around with feeling like you need to hold your chest (which doesn't take much when they're super-sensitive). Built-in bras are at least a little less obvious what they are at a distance, but still something that catches attention if people try, say, folding your laundry or hug you with their hands right at the bands.
If you are taking spiro, make sure to hydrate well. Easy to get dehydrated even if you feel like you're drinking a lot.