I have a cold sore on top of my lip. if i brush my teeth and used it to scrape my tongue is there a possibility of spreading the virus to my mouth right before i had the sore i might've had thrush?

Probably not: And you give no indication of having thrush.

Hard to tell: Herpes/cold sores spread rapidly and never leave your system. The often they develop from reduced resistance and sometimes trauma or irritation. Some people may go a long time without an outbreak while others seem to get them often. See your dentist or physician to discuss your treatment options.

Yes: It is easily spread when it first starts and there is a fluid filled blister. Thrush is not associated with hsv ii. Were you on a course of antibiotics?