Question about rogaine, confused

[Samiam]

Ok so I am 17 years old and I started rogaine a month ago. The first 2 weeks, I had like no increased shedding, the following 2 weeks, my hair has increased shedding. I know you go through an increased shedding, but why did it take 2 weeks into the treatment to start, should I stick with it for a couple of months??