Could I be pregnant?

Hey ladies!

I am expecting my period in 3 days, but today there’s been a tiny bit of light blood - a pinkish pastel color when I wiped after peeing a few times. My underwear has like one spot, too. My fiancé did cum inside me this month, but he has varicocele and supposedly is unable to conceive.

I was super duper stressed today about an exam (Im a senior in college)... not sure what to think about it. I’ve heard of implantation bleeding. Do any of you have pictures or experiences similar? Anything appreciated! Thanks!!!