Help!!! Ectopic pregnancy?

Satyra
So my HCG levels are raising but they are raising slowly from what I am being told they went from 344 on 7/7/15 too 789 on 7/9/15 and then they went to 1153 on 7/11/15 but I have been experiencing some brown like discharge and on rare occasions I see a little bit of red I'm scared that I may have a ectopic pregnancy have anybody ever experienced anything like this? Waiting in a ultrasound doctor said they may not see anything yet but wants to check anyway! Does anybody know about this? Please give advice so worried right now but trying not to stress doctors also said pregnancy may not be viable