Period ended 7 days ago and had unprotected sex, now 2 days later I am spotting brown/red and cramping

So this is the ninth day of your cycle?
(Day 1 = first day of your period)

I think you are not pregnant.The brown/red spot is your period.It doesn't end yet.

It is very possible, since your period ended a week ago, this could be the spotting when you conceive. But there is no way to know until you see if you miss your next perod or not