If you have German roaches you have a problem that will quickly escalate. They like to hide in tiny, dark, hard to reach places where food debris may accumulate and moisture is readily available. Kitchens are their perfect breeding ground for this reason! They are also developing resistance to pesticides that used to work. Looks like too many people tried the Big Box store solutions.
German Roaches leave an egg sack called an ootheca which holds between 30 to 40 roaches and looks like a grain of rice. It gets attached to the underside of hidden areas just waiting to hatch.