How many days after implantation can you test?

Carly • 3 little girls! Riverlynn 6/18/2013 & Rynnleigh 8/13/2017 & Rosalin 11/6/2018 and 1 little boy due 5/8/2021!
I'm pretty sure I had implantation on Saturday possibly sunday...how many days after can I test?