That's a good number. There is such a wide variety of normal though you can't just go by one number. That was higher than mine was and I'm now 25 weeks :)
That Is great for 4 weeks congratulations and try not to stress
Oops correction, your between the 5-6 weeks mark lol
Actually that's quite normal for 4-5 weeks. At 4 weeks it's generally 100 then jumps to 1000 at 5, so your probably right in the middle, perfectly healthy :)