Was this implantation bleeding??

Avery

So, I was supposed to start my period on June 15. I started a week early, on the 8th and it only lasted three days instead of my usual 5 or 6. The first and last day were so light, blood only came out when I wiped (TMI I know, but just trying to paint the picture) and the second day was medium I guess, I only needed one pad for the entire day and it didn’t completely fill up. I’ve definitely been sexually active this past month and haven’t used protection so there’s definitely a chance I could be pregnant.. could this be implantation bleeding? Or am I just looking too far into this? (Also, the bleeding went from light pink to a dark, brownish red)