Negative pregnancy test after several positive pregnancy test and confirmed ultrasound!

After trying for several months we finally got our positive!!! After having a miscarriage 5 years ago we’ve been praying for this day every since!! Of course in disbelief I kept taking test and got 6 positive!!! We are soo exited! We went to our doctor and she confirmed our pregnancy! But it was too early to tell how far along we were! Based on my last period we are guessing around 4 weeks! :))

... a few days later I decided to take a digital pregnancy test (the one that estimates how far along you are) to our surprise it came back NOT PREGNANT! Of course now I’m thinking the absolute worst but I have no symptoms of a miscarriage.. from google... I read something about a hook effect? Has this happen to anyone else. 😭