I sometimes wonder if folks who worry about losing "only" three pounds a week read any of the other posts here at 3FC. There are so many threads about slow loss from people who lose three pounds in a month or live with plateaus lasting for half a year that it seems impossible not to learn from reading these other threads and internalize the lessons.
Three pounds a week is not only good weight loss, it's excellent weight loss. Given your current height and weight, losing at a faster clip than you already are would probably be unhealthy. If you're sweating over a three-pound-a-week loss, I hope you'll prepare yourself mentally for the considerably slower losses you'll face as you get closer to goal. Plenty of featherweights are delighted if they lose half a pound a week.
This is stuff that has been said in countless other threads too, though. My advice is to read them and apply what you find there to your own situation. 3FC is an invaluable resource, but it helps to use it as a library, not just a sounding board to solicit answers to specific questions. It's great for that too, but a lot of previous posts contain general wisdom that applies to specific situations as well.
Edited to add: Here's a thread about
the slowest loser on 3FC. Take a look at the successes each of these posters have had and not at the length of time they took to achieve it; what ultimately counts isn't how quickly it comes off, but how tenacious the "loser" is.