BD on possible fertile days

chey 🐝🌻 • Mommy to be 10/24/22 🤰🏼; Pregnant with PCOS. ✨
I have another app called clue and it's what I used to track all my bleeding and things. I believe the app was right about my fertile days because I have discharge that was white and stretchy. My boyfriend and I BD on Saturday which was the last day of my fertile window. Now today, Monday, I'm experiencing light cramping. If it was correct, could this be implantation cramping?