It took 4 weeks for my levels to drop below 5. And I had a chemical. I miscarried around the time my period was due, so I only found out after bleeding for 3 weeks. I think it's very personal. (I obviously went to get blood tests to confirm because they're free in Australia)
I miscarried at 8 weeks and I tested negative after two weeks.
I had a missed miscarriage in 22 at 9 weeks found out at 12 lost them at 15. I tested positive for a month or longer probably closer to what would have been 20 weeks or so. I had a chemical in May and tested positive the night prior but negative the morning I started bleeding. Sending you love I’m sorry for your loss 🫶🏻❤️