Well, for myself, I get some shedding at about week 2 but at week 3 it really kicks in. I don’t shave at all during this time as it will only slow down the process. It looks like the hairs are growing but at a very slow pace - I can compare as usually there are odd hairs that were probably missed in the overlapping, which are actually growing and they get to twice the length in the same period of time.
My sister’s was a different case entirely. Since her hair is coarse, after shaving, you can see small black dots. It remained this way after treatment (test patch) until about week 6, when they started to disappear (I guess slough away). She had no hairs ‘growing’ out in the first 2-3 weeks and therefore no shedding. The important thing for her is that nothing new started coming through until after week 8.
She is only 2 weeks since her first proper treatment and so far it looks like the situation will be the same again.
To sum up, I wouldn’t shave. If the hairs are going to shed in about a weeks time, it will be easier for them to come out if left alone. If they don’t then at least you can tell that they just seem to be growing normally or if any new growth is coming through.