IMPLANTATION - TMI

B
On October 19th-20Th I had what I believe was implantation bleeding/spotting. I wasn't ever "flowing" it was pink discharge essentially and even slightly brown a one point.
It wasn't ever blood and wasn't period like.
On Friday (4 days after first day of IB) I got a negative test result.
Period was due Saturday and today(Sunday) it still isn't here. No cramps or period symptoms. Should I retest or accept the negative?? 
Thanks mamas!