Pregnant?

So my husband and I had a miscarriage at 7 weeks at the end of October so I decided to start on the pill first thing to prevent the heart break again until we were ready my period came December 5th but had to stop the pill because my insurance was delaying shipment. I haven’t gotten my period it’s 7 days late I took a pregnancy test 6 days ago and it was negative...is it possible ? Or is it just late due to the hormonal change ? I’m so scared