3 months postpartum

So when I was 6 weeks pp I was almost completely done bleeding. Then I started my birth control and I bled heavily for the whole month. I decided I would give it another shot three days into my placebo pills because the bleeding got a lot worse and sure enough I stopped bleeding for two weeks. Then about 4 days ago I started spotting and getting slight cramps and today it stopped completely. It was light pink bleeding and never got heavy. Me and my SO used condoms for about two weeks after starting BC like the doctor recommended and since then he has came in me twice (oops we were in the moment). Is it a good chance my bleeding was implantation or possibly my body getting used to my BC again. Help 😭