Yes, it is okay to push back when you're feeling overworked. In fact, it's important to speak up and communicate your concerns. Pushing back can help prevent burnout and improve your overall well-being. It's important to remember that your mental and physical health should be a priority, and sometimes that means pushing back on tasks or deadlines that may be causing excessive stress or overwhelm. However, it's important to approach the situation professionally and communicate your concerns in a constructive manner.