I have endo. I have severe pain with my period, but the endo is actually not that bad and the doc that did my lap said it probably wouldn't have a big impact on fertility. For other reasons, we have had to use IVF to conceive, but having it does not necessarily mean you can't conceive. Nor does it even mean you may have difficulty conceiving.
It's always shocking to hear these things and our minds race ahead to the worst case scenario. But it's most likely that you will have babies!
Hope all goes well with your lap (or pregnancy before that maybe...?)