If you ever have concerns about hormones, you should always talk to your doctor. That said, I know from personal experience that boobs grow very weirdly. For me, it was almost overnight that I went from flat chested to B cup. It was intense.
It may be similar to how many people who take T feel like their throat is itchy after only a few days to a week on T, when the voice doesn't drop til about 3 months. So it could be just in your mind, since you only started, but if you're concerned, talk to your doc.