I would say you're definitely doing the right thing. We did similar, and it was only once she got to about 9 weeks that we started trying to have some kind of sleep pattern. This is actually when she started to sleep alot longer at night. I was happy before then to feed on demand, and during the day now, i still feed her on demand (usually 3-4 hours now, but will feed after 2).
congratulations by the way xoxo