1)Having CAD at your age with your history is unlikely. Do you have any family history with premature CAD?
Do you have any shortness of breath? Are you experiencing excessive sweating? Are you feeling any pain in your left arm, jaw, neck? Are you pale? Do you have excessive bleeding?
If you are experiencing such symptoms i would recommend ER.
2)You could be experiencing an anxiety
attack or simply you over stressed yourself after lack of exercises (stress full) after your pregnancy