I am having vaginal bleeding following my tonsillectomy 2 days ago. is that ok?

Alteration: of cycle can occur from stress, tension, anxiety, surgery, infection , metabolic and hormonal issues.

Likely yes: It is very common to have either early or a somewhat changed menstrual cycle secondary to stress such as the stress from surgery. It is also possible that you may have received some medications that may have made it slightly more likely for you to bleed at least temporarily. Also unless the bleeding is severe it is unlikely that represents anything significant in the short experience you describe