What could have bit me? (Pics)?!

What could have bit me? (Pics)?

I will give you a little history first. I am 33 weeks pregnant, I was at my parents house visiting (they live on a farm in Southern Cali), I was sitting on the porch and it felt like something bit me on the ankle, I swatted at it because I know there are horse flies and mosquitos so I didn't think anything of it. I felt one on the other ankle and did the same. I didn't scratch it or anything though. Today my ankles were stinging so I got a look at them. They were swollen, bright red, rock hard and hot to the touch. They looked like this;
http://i207.photobucket.com/albums/bb9/s...
http://i207.photobucket.com/albums/bb9/s...
I already went to urgent care. I got back about a few hours ago. The doctor saw them when they looked like this, he said he didn't know what it was. He told me to keep my feet elevated and that it was possibly a large mosquito bite. Doesn't look that way to me. Never had one spread either. Anyone know what could do this?

5 days ago
I took more pictures just now. It has gotten worse in the past few hours. But I have not been scratching or irritating it. Here are updated pics.
http://i207.photobucket.com/albums/bb9/s...
http://i207.photobucket.com/albums/bb9/s...

I'm no doctor, but it looks to me like either a scratched insect bite (which you denied), or an allergic reaction to an insect bite. The actual insect more than likely was a mosquito, because a horsefly bite is much more painful.

The allergic reaction might be due to your pregnancy (how, I don't know), or possibly some bacteria of virus which entered with the bite. The West Nile virus shouldn't be a problem in California yet this year, but I'd check the CDC website if I were you.