Krissy,
You dont say how long you've been running but to be honest if you think you can run 3 10k's in consecutive weeks, you probably can.
I find this time of year I need all the motivation I can get to run and frankly I dont think there's much better spur than having a race to look forward to. I'm probably doing it all wrong but I tend to only do one run between races when they are on consecutive weekends and with trick or treaters, fireworks, fog etc that suits me just fine.
Go for it!