Positive blood test negative preg test? ???

Jess • Been with the love of my love for almost 8 years, married 17/08/19 baby boy 💙 👶 05/10/2019 baby boy 💙👶 April 2022 baby girl 🩷🧒 March 2024

Hi I’ve had a negative pregnancy test but a positive blood test is this normal? My doctor says I’m pregnant but I’m finding it hard to get excited just due to having a previous miscarriage before having my son, I’m just anxious. My levels are low so need to have more blood tests my doctor thinks it’s really early. Has anyone ever experienced this