Just sick?

I'm looking for some outside opinions. I've been SO exhausted all week. Then yesterday, I all of a sudden started feeling miserable! Chills, but no fever. I couldn't keep my eyes open, and I couldn't walk straight because I was so dizzy. I had to call in sick to work and slept the rest of the day and night. Today the chills are gone but I'm so weak and sore. I just feel disgusting.

I'm 11 dpo.

Do you think I'm just sick? Or could this be pregnancy signs? I'm not testing unless I miss my period.

I know no one can tell me if I'm pregnant. I guess I'm curious if anyone has experienced something similar.