Proviron is a modified DHT and DHT promotes hair loss, in those who have the genetics for that.
You probably have zero knowledge about these things and are destined to make the typical harmful mistakes that we see all of the time.
Male pattern baldness is not considered reversible. But a 5 day experiment is not predicable either.
You are probably going to loose hair and any gear that you use will speed it up. Taking 5-alpha reductase inhibitors to lower DHT and reduce hair loss carries high risks for some as it can cause permanent HPTA changes and very low T levels. DHT is essential for development and maintenance of the male sex organs and also critical for libido. So you can't win either way and can loose it all.