Implantation bleeding after pregnancy sex!?

It’s sorta a lot but please read!!!!

Okay, so.. I gave birth September 4th SO & I had sex on October 5th & October 9th. (4-5 weeks postpartum) & Apparently from what I’ve read implantation bleeding can occur anywhere where from10-14 after conceptions (up to 5 days after sex usually) well I’ve been cramping slightly off and on, dizziness, quizey, low blood pressure, & increased appetite for a few weeks but tonight my cramps were strong sorta and I had super super light pink in some discharge when I went to the bathroom but when I went again there was nothing. Keep in mind I wasn’t breastfeeding very often at all(currently not now) I didn’t have my period (still no period)

Could this be implantation?(I would only be about 3-4weeks pregnant)

OR

Could this be start of my period??