Spotting and cramping - OB did nothing

I am 9 weeks tomorrow and started spotting today. Sorry if tmi - the spotting is when I wipe and dark red. I have been lightly cramping all day, nothing more painful than usual, just more frequent. I called my OB and she said that my ultrasound last week was normal so they won't do anything unless it gets a lot worse. I'm sure that's a typical response, but I am a ball of nerves because my previous pregnancy ended in MC around 5 weeks. Ugh. Any advice or insights would be appreciated.