See a different doctor and get a referral for an u/s darl, you should be able to see the sac and a faint heartbeat by now, so that should clear some things up.

It took me a week to start bleeding after losing my second angel at 5 1/2 weeks, and two weeks to start bleeding after losing the third angel at 8 weeks.

With the second angel, I had pos preg tests (about 8 of them) and a neg blood test the day before the u/s. The u/s showed a sac, but no heart beat. With the third angel, 10 pos preg tests and 2 pos blood tests, each one with lower levels than the last, and the 1st ultrasound showed a very slow heartbeat.

Is it also possible that you miscalculated the date of conception? With DS, I had 3 pos preg tests and a blood test with a hcg level of 5 when af was 3 days overdue, and I didn't get the implantation bleed until the day after the first pos preg test (also when af was three days overdue), so don't start worrying yet darl, could just be nothing, or your kidney's are just working extremely well and getting rid of all the hcg from your system really really really quickly

Sending sticky vibes your way and my fingers are crossed for you!