Whether or not you establish you have Diastasis Recti, make sure your doctor checks for a hernia. Larger hernias can prevent the diastasis (separation) from healing. And some hernias require surgery since it’s a protrusion through the cavity wall. Otherwise you should be able to create a healthy core again, even if you have the diastasis.
Please see Test yourself for Diastasis Recti during pregnancy and after pregnancy to self-evaluate if you have diastasis recti. If you do, you should do the exercises found on the CFS Method DVD to regain a healthy core, which can take several weeks to master depending on the severity of your diastasis.