Positive home test, negative and then positive urine test at dr??

I’m still about 3 days from my period, only 10/11 DPO but last night took a test and it was positive!

I took actually 9 total at home, all positive.

I went to the doctor and they said it was negative, the nurse knocked and then said a minute later it was positive.

I’m SO nervous I’m going to have a miscarriage, and they scared me about it.

I’m apparently 3 weeks, 4 days pregnant, and due September 14th, 2020.

They said I’m really early, but it could also be so faint because it’s not implanted correctly and case miscarriage.