Ovulations after pregnancy

I had my son 7 weeks ago. When he turned 5weeks i got my period back after giving birth. Today is my 3rd day ovulating and i feel a little pain in my left side and I'm bleeding brown blood. Its been 10months since i went through this. I had sex protected and unprotected(pull out method) could i be pregnant again? Has this happened to anyone? Maybe Someone who has gotten pregnant 2 months after giving birth