Spotting 3 days before period

Hey guys my period should start in 3 days and it’s been an average 28 day cycle recently. I had sex protection on the 27th of October and I had some light spotting looking discharge when I wiped there’s was light pink discharge on my tissue paper and like a bit of that in my underwear. I’m worried I’m pregnant could this be related to pregnancy spotting or implantation bleeding. Want to hear from someone with similar experience. We had protected sex and 27th falls towards the end of my fertile period I thought I ovulated already around 24-26th mark sooo yeah what do we think. When I went to wipe again that discharge isn’t there anymore. It hasn’t developed into anything heavier atm. Let me know your thoughts I’m going crazy at work !!