Hcg after miscarriage ?

Steph

How long after your miscarriage did your hcg not show up on pregnancy test? I’m currently at the end of what I believe to be first period after miscarriage (7days bleeding) , miscarriage bleeding stoped on the 27th of March I was only 6 weeks ment to be 9 and took a test this morning to check it had all gone and still a very very faint line squinty ? Just wondering if it was ment to still show after the period? Xx