ectopic pregnancy, misscarriage, normal???

Shelby

I have been experiencing light to moderate cramping for about 4 days (im 4 weeks pregnant). Yesterday i had some super light brown discharge and today its more of a dark drown and i can see it slightly when i wipe. There hasnt been any heavy bleeding yet. im super nervous. My doctor scheduled me for 4 days from now to go in and make sure its not ectopic. Has anyone had this happen before??