Yes, a diastasis recti can get worse with using your abdominals incorrectly with activities of daily living, doing improper exercises like crunches and with sporting activities. Closing a diastasis is all about healing the weak and stretched out connective tissue between your separated muscles. During the first six weeks of the Tupler Technique® Program the emphasis is on developing transverse muscle strength and awareness while allowing the connective tissue to heal. The transverse muscle is the innermost abdominal muscle which you use with every breath you take and every move you make. That is why you have to develop an awareness about using it with activities of daily living and then while exercising so it is a diastasis safe workout. To learn more about the research and evidenced based Tupler Technique® to close your diastasis before it gets worse. 
To learn more about Diastasis Recti & the Tupler Technique® read this article: DIASTASIS RECTI RESEARCH AND EVIDENCED BASED EXERCISE PROGRAM
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Watch the short video below to know what a diastasis is.
