Weight gain.

I've read women gain 3-6lbs on average in their first trimester. I'm 6wks 2days and I already gained 4lbs. 4lbs may sound like nothing, but prior to TTC, I was attempting to gain weight and couldn't put weight on for anything. I went from 9lbs to 101lbs in two weeks. My boobs are getting bigger and I barley look bloated.  I'm eating healthy, so I probably should t worry about it, but I'm curious-- how min weight has everyone else put on in their first trimester?