Period for 3 days and soar boobs after?

Audrey

So I had sex a lot during what I thought was my fertility window. As well as most of the month. My period was scheduled to start on the first. I had been lightly spotting for the last 3 days before the first and I got a heavy, non clotting period. It only lasted for 2 and 1/2 days. My period stopped but my boobs are still soar. Could I have had heavy implantation bleeding? Should I take a test? Please comment what you think.