FREAKING OUT!!

Natalie
I'm 7 1/2 weeks pregnant! Went to Dr. On Tuesday got ultrasound baby's heartbeat is strong everything looks good! Today I woke up to some pink spotting, low grade cramps (I'm gassy though) so all day only a few light pink drops. Now I'm wiping and there is a dark brown discharge with what looks like tiny I mean tiny pieces of idk. Something. I spoke to my Dr. They said to go to emergency room if I had heavy bleeding or cramps. Which I don't. So I'm freaking I had a miscarriage in Jan and really hoped this one would stick! Any thoughts would be appreciated.