Took 3 ibuprophen day before colonoscopy will it be ok?

Depends : how long before ? You might bleed a little. Make sure you tell your physician that before the procedure.

Possibly: but taking NSAIDs the week or two prior to your colonoscopy can increase your risk of bleeding. You should definitely let your doctor know.

Talk with the doctor: At your age it is unusual to have a colonoscopy ordered. The main risk from the ibuprofen is if they have to do a biopsy or if there were a complication extra bleeding could be expected. Talk with the doc but I doubt they'll cancel the procedure.