Implantation Bleeding

Has anyone ever experienced implantation bleeding? I’ve been spotting for the last 4 days, its very very light and i barely need a panty line (tmi). It started on day 16 of my cycle and was 7 days post baby dancing. could it be implantation bleeding? if i took a pregnancy est in the am is there any chance it would show a positive if i am pregnant. Thanks to everyone in advance