Pregnancy after miscarriage

Abby

I had a confirmed miscarriage on the 1st March, I would have been around 4- 6 weeks unfortunately they think it could have been ectopic or abdominal. My hcg levels on the 1st March were 165 previously 26th Feb they measured at 600 ish. So dropped quite a lot within a couple of days.

My bleeding finished on the 3rd March.

How long after should I expect a negative pregnancy test?

I did one first thing this morning and it’s still positive.

Also has anyone become pregnant before their first period after miscarriage?

Thanks in advance