My hcg level went from 40 to 30

ellome
Today went back for hcg level check and dr told me i went from 40 to 30 😔 they want me to go back in 3 days, this is so hard and stressful.. i hate to go through another miscarriage, this would be my 4th one 😟 i have 5 other kids my youngest are 3 going to be 4 on august "twin girls" ... could there be something wrong with me? As anybody gone through this? What should i do? I am really sad and it hurts me so much to go through this pain