If its there first time there maybe a chance they will eat the eggs, this does happen from time to time. Do your water changes as normal, just be careful not to go too near the parents as they will defend their eggs (and nips can hurt). If they hatch the eggs, again wc as normal until the fry are free swimming and the egg sack has gone. You can then start feeding the fry using either, crushed flake, or crushed cichlid pellets (I use a pill crusher), newly hatched brine shrimp, fresh or frozen, cyclops is another excellent fry food available in frozen form, you just need to cut a small amount off the block. Once you are feeding the fry you will need to do more water changes and monitor your water conditions carefully (more waste production).
Convicts are really easy to breed and are brilliant parents.