Likely a phase.
One of the biggest misconceptions about male pattern baldness is that it causes hair to simply 'fall out' and that's it. male pattern baldness doesn't work like that.
Our hair grows in cycles - Everybody sheds hair - men, women, whether balding or not. It's completely normal ( I think an average person sheds 100 hairs a day).
For a man suffering from male pattern baldness, in each growth cycle the susceptible hairs grow back slightly finer and slightly shorter. This cycle repeats itself until the hair becomes so fine and short it's practically invisible. Then it dies altogether and the follicle dies. But a normal sized hair doesn't simply fall out and never come back, unless you have a different type of alopecia.
So counting the number of hairs you find on your pillow, comb, in the shower, or wherever, is pointless as it isn't an indicator of male pattern baldness. If you're shedding more hair than usual then it's for some other reason. Shedding more is common when using treatments and it's usually a good sign.
I have heard of some horror stories where people used Minoxidil and shed, and claimed the hairs never grew back. But these are anecdotal stories on the internet so I don't know how reliable they are