How quickly can shedding happen?

ph1

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I've been on Rogaine Foam for a week and I've just noticed that the part of my hair behind my temple points has thinned a fair bit. I'm applying the foam to my temples and the middle front bit of hair. But I haven't noticed a shed there which is where i primarily apply the foam. I imagine that the foam has got onto the parts behind the temples but I just thought it's weird to be shedding there and it being so soon, is it possible?
Cheers
 
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