HCG increasing after miscarriage.


We have been tracking my hcg level since my miscarriage on the 30/08.

It went from 1480 when I started bleeding to 147 on the 2nd and my last reading was 39 a week ago.

The bottom test was taken the day after the 39 result and the top was from just now.

I know that there is no chance of a viable pregnancy and I have also had 2 ultrasounds and nothing suss ectopic wise was found.

I'm assuming that the only other possibility is retained product but wouldn't that have shown on the ultrasound?

Does this mean a d&c is likely? I really want to avoid one if possible.

I'll be heading to the drs tomorrow anyway.

Thank you for any help.