D..
You CAN have strep without a sore throat. And a queazy stomach is one of the tipoffs.
My kids have had strep many times with no fever. The last strep my older teen had was with a queazy stomach and no sore throat. I mentioned it to his doctor at his physical because it had bothered him for two weeks (he had college exams and then came home), and my wonderful doctor did a strep test. To my shock, it was positive.
It's important to treat strep. It can cause a lot of problems untreated.