infertility post miscarriage?

Sarah
Let me start by saying that I have a 2-year-old son who was a surprise (we weren't trying but weren't NOT trying). Then, we got pregnant the first month of trying for baby #2...but I miscarried at the end of August at almost 6 weeks along. My husband and I have been trying for 5 months now with no luck. I've heard that you're supposed to be more fertile after a miscarriage but that hasn't been the case for us. 
I know it's only been 5 months, but I'm just curious to see...if you've had a miscarriage, how long did it take you to conceive afterwards?