Miscarriage, lingering hcg, please help!

Laura

So....it’s been weeks. Miscarried at 5 weeks, max hcg draw was 140 (I presume it was higher, but I started bleeding before that draw). Now....it has been lingering. 24, 19(different lab), 21, 15, 20. Should I be concerned?? Doc hasn’t offered a scan...but I think it’s time.