HELP!!!

Sierra

I had my son 7 weeks ago... I had sex 4 weeks after I had him but I got my period on Jan. 7th and it lasted until the 11th.. Well yesterday I wiped and noticed pink blood on the toilet paper and it's still happening. I know they say youre very fertile after you give birth so is it possible that its implantation bleeding. With my son I didnt bleed at all. I need help I'm freaking out!