Possible pregnancy ALREADY?

Hi! I had my son on May 21st, so I am about 12 weeks postpartum. I got my period back at around 9 weeks PP (July 24-28). My husband and I had sex on August 3rd. It was the first time since I gave birth because any other time we’d try it was still too painful. We didn’t even think about the fact that I could be ovulating because it had been SO LONG since we had had to worry about it and SO LONG since we had had sex that we were just excited🤣

Anyway, a couple of days ago I started spotting light brown/pinkish discharge 😳

I never had implantation bleeding with my first pregnancy, could this be what it was??

It’s not even close to time for my period again and it only lasted 2 days.