Dianna - I would say there is still a good chance you can fall pregnant, it just depends how tired your body is and that's a hard one as we don't know that... I would say have plenty of vitamin c, fruit and veges, rest up as much as you can (in between tee hee) and see what happens....
I got sick in one of my cycles ttc and we didn't conceive but it may not have been because i was sick, it's hard to say.... Good luck anyway!! I'm sure many women fall pregnant when they're sick.