Same here...been in quarantine...showed the symptoms the Tuesday before last.
I knew it was COVID, because I felt the same way after my second shot, aches and pains and a low grade fever. By the fifth day I was mowing my half acre, today back to normal. Wife has it probably, a mild cough and she is on renal failure waiting for a kidney, she had her two shots.
I have a suspicion how I caught it...watch out for clueless people in your work environment or area whether they are vaccinated or not... who sneeze and cough without covering their mouths....who refuse to wear a mask just our of common curiosity in crowded areas... and if they were sick and know about it are more than willing to spread it around just because they want to take as many as they can before they die.
By the way "Masks" are useless, but I will use them around people at risk or if have the symptoms of a cold, flu or fever...It is better than nothing and it might reduce the transmission by 10 percent, this virus can get into you through other means than your nostrils...