Spotting. A little TMI description.

I'm 6 weeks 5 days. Last night before bed, I went to the bathroom. When I wiped there was some blood mixed with CM. I would say between pink and red. No cramping. Except that morning DH and I had sex and i was crampy during. But not since. It's the next morning, no spotting since. It's a Sunday so my obgyn is closed, but should i go to the ER to make sure everything is ok??