Flu like symptoms-CD21

Savannah • I`m 30. Had baby #1 after 3 years of TTC, 1 year of fertility treatments. Going to try for#2!
Anyone had any similar experience? I'm on cd 21 and I am achy with a low grade fever. Dr ruled out flu and strep... It's still too early to test I think... Is this a good sign of pregnancy or just wishful thinking???
​Been TTC#1 for around 2yrs