baby #1 was a shocker, ttc baby #2 is heartbreaking!

when my husband and I got together we both were told it was going to nearly impossible to have kids between the two of us. He went through chemo and radiation and I bled maybe once a year. so when my boobs started to swell and we both had the feeling but didn't want to get our hopes up too much, we were ecstatic even though our daughter was a shocker. Now trying for another one. its been over a year and I'm some what regular but I still wonder if theres more I can do! is it me or him? is it still nearly impossible since we've proven the doctors wrong once already?! its so consuming and heartbreaking but I keep holding onto this tiny piece of hope!