I'm on Remicade and 6mp also. When my wife and I were trying to get pregnant, we were having a tough time conceiving. My wifes doctor ran all the tests, and even tests on my sperm count and motility. There were not any problems with my "swim team", and at that time I'd been on the 6mp and Remicade combination for a few years.
I'm taking 50mg of 6mp a day and 1000mg of Remicade every 8 weeks.
My GI and GP all said that there shouldn't be any problem with 6mp or Remicade.
None the less we couldn't conceive and chose to adopt instead. I think the GP finally got as far as she could go with the tests on my wife without it getting beyond what our insurance would cover. We never did figure out where the issue was, but according to her, my tests all looked OK.
So, while we didn't have a baby on these drugs, we could have, and the doctors all said there shouldn't be an issue.
In the end we got a perfect little boy through our county's adoption program and couldn't be happier.
I hope you get the answers you are looking for. I wish I could have been more help.
"I'm just along for the ride."