I think it's a definate possibility given that you had two blasties transferred! But hcg levels are an indicator only - my level at 4 weeks was around 200 (so a bit higher than keen's actually) and there's definately only one in there!

A friend of mine conceived on clomid and her level at around 4 weeks was nearly 500 and this was also a singleton.

Just depends on the individual I guess, and levels double so quickly at this stage that if your dates were a bit out (although not in your case Meg being an ivf prg) your levels might seem higher?

I hope it is twins if that's what you're hoping for!! My best friend has two sets under 3 - YIKES!!