Pp& questionable spotting

Kortney

So I am 11 weeks postpartum and have not gotten my period back yet. (I initially breastfed, but due to babys weight loss, switched to formula) around 6.5 weeks. I asked my Dr when to expect to get it back, his response was if I hadn't gotten it 3 months from when I stopped breastfeeding I would need to come on and see them. December 12 I had "spotting" I guess?! Lol, it was more like a spot! I had a tiny bit of light pink discharge when I wiped, then had a very small (less than a pea size amount) of brownish blood on a liner then nothing. girls at work are constantly teasing me about being pg again already. could the "spot" have been implantation bleeding? idk what to consider it! any thoughts