Please go see your doctor again soon, and if the cramping gets worse or you feel any sharp pain, go to A&E straight away. I know the waiting and not knowing is really hard, but only your doctor can properly track what is happening with your levels and the scan, so do not try to read too much into the numbers on your own. I went through a scary early pregnancy scare myself and honestly the uncertainty was the worst part, so I really feel for you right now. Please do not wait if anything feels off.