I didn't get tested with mine. I took 4 positive tests (couldn't believe my eyes) so doc didn't need further evidence. Hcg should double all the time when pregnant so if it decreased, unfortunately your friend is probably going to miscarry. I had a spot of bleeding at 8 weeks and did a text which was v faint cos hcg was depleting. I miscarried 4 days later. There is such a thing as a `missed miscarraige' in which the blood just comes with the next period. Also, it can take time for your body to bleed after a miscarriage. Hope this helps. x