to prepare for the egg to come down
Yes. You get discharge before you get your period.
That is called spotting. Women often spot the day before or a few days after their period.
You have discharge right after the period that just ended and it lasts
Yes, some women experience vaginal discharge just before periods but regular sanitary pads are not needed. So you can use liners. They protect well for this kind of a discharge.
Yes. Brownish discharge two days before one's period does not definitively confirm pregnancy.
Just liquid giving the sign of period.