Thanks for the query.
As you passed blood along with sac there is less possibility for viable pregnancy
The presence of blood clot and absence of products of conception inside the uterus
Pregnancy test comes positive until the beta hCG
levels come to zero levels.
It will take sometime to achieve this. No need to worry about it.
If you are still having continuous bleeding better to consult gynecologist and take tablets to expel the blood clot.