I want to get a blood test but I smoked a couple days ago

I’ve been experiencing weird symptoms lately. I get lightheaded out of nowhere, my vision shifts (like if the world twitches) & this weird feeling of dizziness. I think I may be diabetic.. I really don’t know. I smoked about 3 days ago for 2 days in a row so I want to know if that’ll show up on the test? It wasn’t a lot, I didn’t get messed up, just buzzed. The last time I smoked for days was about a month ago prior to my surgery. I quit about a week before my surgery which was on August 28 (Last Tuesday). Will the thc show up? Should I take an at home drug test? I’m 17 btw