Spotting/Implantation Bleeding; does it ALWAYS occur??

Hello everyone. I'm 5 days late, experiencing milky white discharge, cramps & backaches. I'm not sure if i'm pregnant, so I'm planning to take a pg test in a couple more days. (I want to wait untill at least 1 week after my missed period before testing) But i have a question about SPOTTING. I know that spotting is blood you discharge as a result of a fertalized egg burrowing/attatching itself into the uterine wall, but what i dont know is if spotting occurs in EvErY pregnancy. And when spotting occurs, is there always a NoTiCiBle amount of blood thats discharged? In other words, if i am pregnant, should i be looking for spotting, and will i be able to tell when it's happening? Any comments/advice would be very helpful. Thank you very much for your time! And for everyone out there who's TTC, i wish you tons of luck!!!! :)

[HopefuLEE19]

I cant say from experience but ive read LOTS of forums over the lastfew days and no its not i every pregnancy so if you dont get it that doesnt mean your not pregnant? good luck! :)