I'm so freaked out and shocked ! today's the day !

Last night I had a positive test will post pic ... I'm apparently 6 dpo but was 5 at the point of testing I had a misscarriage 10th of Nov it's 27th now it seems impossible but my hospital discharged me when my levels were under 5 so it can't be that I'm going to get my hcg blood redone and doing an early pregnancy test when they arrive in the post later this morning I saved my first pee yuck I know but I want to see what happens ... If I am pregnant it would mean I conceived within the first week to be producing hcg now how shocking is it ? I just don't know il add a pic of my chart too and the ultra sensitive test what was negative last week what do you all think ? il update later with my test from this morning x