Unsure

Sooo I was late about 3 days had sex with my SO and what I thought I came on the day after we had sex but it’s sooo light I barely don’t have to wear a panty liner and has been that light these last three days. I have no cramps anything I would have regularly with a period. My best friend thinks I’m pregnant. We definitely had sex when I was ovulating and highly fertile. What do you guys think???