Sorry for your loss. After you have a misscariage it usually takes at least 6-8 weeks or more to have another period. So it is possible to be ovulating around that time. I would say you would have just as good of a chance as anybody -which is about 25% but then I have also heard that right after a misscariage, your body can spit out multiple eggs increasing the chance of one of them getting fertilized.

However, most doctors advise waiting until you have had two full menstral cycles before trying to become pregnant again or you will be at greater chance of having another misscariage. (thats what my doc told me and also what I have heard from others)

I had a miscarriage at the end of september and by november 6 I was pregnant again(broken condom, we were not trying). I have talked to a few nurses and they say that it is easier to get pregnant after having a baby or going through a miscarriage. I am now 5 months and doing good.