Just looking for some advice, I dont know dates etc but I got a positive test (6 actually) 3 weeks ago. On Sunday night there was some dark blood on wiping, Monday I had a scan at EPU. Nurse estimated 6weeks, could see a sac but too early for heartbeat. Have a return appointment in two weeks. She suggested that it could be delayed implantation bleeding. Today bleeding has become slightly heavier, still very dark, no cramps or clots. I dont know if I should continue hoping that it will be ok in 2 weeks time or if the increased bleeding is the start of a miscarriage? How can I tell the difference?