Hi Kimba83,
I didnt really buy anything till i was about 26 weeks, i was a bit nervous to get anything before then. Saying that i had done all my resarch and worked out exactly what i wanted to get, so it was just picking everything up. and I didn't have the room finished till about 2 weeks before ds was due.
Just do what ever you feel comfortable with! and like the others said remember people will give you heaps of stuff!
Most of importantly have fun shopping