It doesn't sound like strep throat, which is typically sudden onset, quite painful, high fever out of nowhere, and you'll have white slimy things on the back of your throat.
Also strep is it's own *animal*, so it's not going ot morph into strep if you get sick with something..... like, say, pneumonia will..... where you can have any old illness and if, left untreated, it goes into your lungs and your lining gets irritated and wet...voila...pneumonia. strep isn't like that. You get strep from someone else who has strep. end of story. You may not know who you got it from....but you got it from someone.
However - I would go to the Dr just to be sure. anyone can get a "kids" virus.... and as a matter of fact, lots of time it's WORSE for adults.
I hope you feel better.