I have a question

Asalamu alaikum sisters.

This is a bit of an embarrassing question, but i do hope that someone can help me.

Erm basically I went on a website where a sister asked this question;
During the months, when i'm not menstruating, i have a yellowish/white discharge that shows up on my underwear. this is fairly constant, and i know it's a natural thing for the female body. Do i have to change my underwear each time i do wudu' and pray? is the discharge considered unclean? i have improvised by using pantiliners which i change each time i want to pray, however this is quite expensive.

and the mufti's answer was this;
1) Any discharge other than blood is not impure. You need not worry about it. It doesn�t affect wudu either.
2) If you have any blood in discharge, you need not change your pant liner for every Salah, you can do it for your convenience.

but the thing is in fiqh us sunnah i read this; Wadi: It is a thick white secretion discharged (by some people) after urination. It is considered impure. `A�ishah (may Allah be pleased with her) said, "Wadi comes out after urination. The person should wash the private parts and perform ablution. It is not necessary to perform ghusl."

I just wanted to know.. is wadi and the regular discharge the sister mentioned the same thing?.. if not, how would you be able to tell the difference?..