Need advice

I miscarried last week naturally.I was 6-7 weeks pregnant. Bhcg level was around 4000 at that time.Bleeding stopped 3 days ago. I wanna ask how long will it take for hcg level to drop zero. I am still getting positive hpt. I might have bhcg test in the next week again. But just wanna know. I wanna get over with this trauamatic experience & start trying again.