My saas said to wait a few days after the positive test before going to the doctor to let it sink in. But honestly, we went to the clinic after 5 days just to be sure.
If you mean how many days after a positive test to visit the doctor, usually they call you around 6-8 weeks of pregnancy. But safe to call your gynac immediately to get their advice on next steps.
I tested positive just 3 days after my missed period and celebrated with dry fruit kheer! For doctor visits, I booked it within a week of that positive line.