So confused! Had this happened to you?!

So today I am 8 DPO! I took a test out of anxiousness but it was negative. I know I still can be early but I'm confused to if I'm implanting or just having after sex cramps.

I saw a litttttle bit of pink discharge yest and today they are light streaks. My boobs are super sensitive and tender. I do have cramps and it feels like my period is coming. I checked on a implantation calender on a website and it says I most likely should be implanting around now! I'm mainly confused bc I had sex last night and there are times when I would cramp and bleed a little afterward. Has this ever happened to anyone?!