I remember learning that the first 3 days of the 7 nikiim are different from the last 4. Can you tell me what's the difference? (I seem to remember something about stains.) Thank you.
Answer:
There is no essential difference between the different days.
On the first day there is more reason to "suspect" stains, and there is a special halachic significance of the bedikah on the first, third and seventh days.
Best wishes.
