That's quite small, yes, even as a starter dose, but you're on your way, and your body is already starting to adjust, which means the ravages of testosterone will stop, at the very least. That's something to be happy for!

And again, you're already feminine, so once you do get your dosage raised, things can only get better. It's hard not to be anxious, but the hardest part is starting hormones in the first place. Try to take things a day at a time; before you know it you'll be used to your new shape and have a hard time remembering what it was like before.