Hello Dr My Name Is Riddhi I Am Pregnant By

Hello Dr my name is Riddhi i am pregnant by 6 week but started spotting from my 5 week and for last two days i have bleeding like nirmal pwriod i got my ultrasound down but they were not able to see fetus neither through vaginal scan as they predict that it was too early i got my hcg level check and it was not double although it didn,t went down but it was 1370 something with my first blood test and after 48hrs it was only 1530 something what does it mean
I have to go for another blood test after 2 weeks