This is the feeling you get when ABS (anti lock brakes) sense a loss of traction. You'll feel almost like the pedal is pushing back against your foot. You may also notice a "humming" sound associated with this action.
When the system sense a slide it will alternately (very rapidly) apply then release pressure to the brakes, in an effort to slow the vehicle without sliding the tires.
I imagine you only notice this on very slippery surfaces, right?
From what I see in your description, there is nothing to worry about. If you continue to feel unsure about it, have a reputable local mechanic have a look at it.
Good luck!
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