Fever?

Nicole • Married June 2013 • FTM March 6/17
AF due Feb 28 (Saturday) and on this past Friday/Saturday I had a low grade fever with no other symptoms of a cold or flu or anything. On Sunday, the fever stopped and I started getting some CM and now my boobs hurt when I poke them, haha! It's unusual for no boob pain as they usually hurt like hell the day after ovulation haha. I had a negative HPT today, but I took it at like 430pm. 
Fever a sign of implantation?