Low grade fever

L
We have been ttc for a year and a half. Could this be it?! I am 8 dpo and started spotting yesterday. It is real light and light brown. I have had a low grade fever starting yesterday too. Fluctuating between 99-99.6. Af isn't due until June 3rd so I think it's too early to test. 
Have you ladies had symptoms like this and it turned out you got your bfp that month??