Are you trying to conceive? (Was this try planned?) Is the issue that your weight-loss is interfering? (Or nutrition isn't what it needs to be?)
If you've never had kids before, I understand it's fairly common to have a miscarriage or more before one "sticks." I had one friend who's wife miscarried, and they were upset about it. But, they gave her a few months "off" to recover, and now they've got (count 'em) 4 kids.
Also, I think I've heard that if you're coming off of hormonal contraceptives, it may take a little while to get "back in the swing" so your body is in reproductive mode again.
Sorry I can't be more helpful or supportive - I never really looked into the biological process of having kids, because I decided that wasn't the route I want to go. (I decided to get my tubes tied 2 years ago). But I'm always happy to see other people have babies when they want them.
I think maybe I'll adopt some day, but I'm not really all that keen on passing my pathetic genes on to some poor unsuspecting baby.

That, and I feel like I don't (personally) need to contribute to the population when there are many children out there who could use a loving home. Good luck with your biological-endeavors, but don't discount adoption as a possible alternative, either.

You might decide it's a good idea whether you end up having bio-kids or not.
--Janis