Does implantation spotting always happen

No, only a small percentage of women get ib. I never did with my two children. Sometimes I wish some people would just Google these thing's.

2/5 times. Who said yes? 

I didn't get it  years of it coming early and hoping it was but nope I just don't get it 

I didn't get it with my first 2, but this time I did

Never had it either time. 

I didn't get anything with my first x