Bleeding and worried

Shelby
I'm 5 weeks 6 days today went to the toilet this morning and there was red blood when I wiped I put a pad on and there was enough blood the 3/4 fill a pad. I'm having mild cramps ( I'm used to very painful cramps due to endo)
Had an HCG and today's level is 21000 (my levels at 5w 2days were 6700)
The bleeding has now eased to just brown spotting.  I haven't had an ultrasound as yet as in Australia the doctors don't like to do them too early ( but I am able to get one in an emergency if I need to)
I'm just looking for some reassurance and prayers out there.