Implantation bleeding/spotting

Abagail

I had just had my period, no horrible cramps as usual and no appetite; still had tender breasts though. It lasted four days and then I started to spot. I know that even after your period you can spot for a couple days afterwards but I never have had that happen before. It came along with some dull cramps and it’s been three days now since the ending of my period. I don’t know if it could just be residual blood from my period or implantation bleeding. I’ve taken four tests all negative. I have had sex within the past 10 days. Could it be possible I had two eggs release? I have a lot of questions and not a lot of answers😅