Missed period. Negative test.

Last week right before my period was about to start, I had what I can I only think to be implantation bleeding. It was nothing like my normal period has ever been like. It was light, it only lasted two ish days, it never clotted and it was a pinky color. Nothing like anything I have ever experienced. I waited a week and today I took an at home pregnancy test and it was negative. Did I test too soon? Was that my period? What is going on? I am going absolutely crazy over here. Any help is appreciated.