Mama, please see your doctor soon, flu while pregnant needs proper checking to make sure you and baby are safe, especially at 6 months. Don't worry, maraming pregnant moms na dumaan dito and naging okay, but you really need professional advice para ma-rule out any complications at ma-guide ka properly.
Stay hydrated, rest as much as you can, and keep warm muna while you're waiting for your appointment. Hugs!