Oral Herpes Q, I Prefer to Have a Dr. Answers This Please...Please take ur time to read, i'm really scared?

So about a week ago I developed minor symptoms of strep throat and i originally thought it was because my brother and my sister had it. My sis was stupid and didn't finish her antibiotics so she gave them to me (only 8 pills) so the symptoms of strep throat went away for about a day and 1/2 then i woke up with a hard time swallowing and a 99.9 temp. on Friday morn. then I noticed a had what i think is a canker sore but i'm not sure on the top of my mouth btwn my gum and cheek, and its about half a cm long (just a guesstimate) and i took a flashlight to look at my throat and saw the white spots on my tonsils. I slept through saturday and it feels like my throat is getting better and my fever hasn't returned in a day and a half which is why i'm worried that it may be herpes because i have been sexually active, I have told my boyfriend about this, he said i have nothing to worry about and that he is clean, has never cheated, and has been tested, and I told him he doesn't have to lie to me because even if he is lying i still need to take car of myself and he said there's no need for that cause again "I have nothing to worry about" It just seems so odd that if it is strep, its going away and at the same time I have a canker sore or what i think to be a canker sore in my mouth. Do I have something to worry about? is it ok for strep to act this way? my mother made me an appointment to see if its strep Monday, if its not should just bluntly ask for a herpes test? my mom has taken me to get tested before this boyfriend before I was negative for everything but HSV cause I've never been tested for it.