HCG SLOW RISING??

So my first beta was sat after some bleeding on 6/19, it was 3895. Today for a follow up on 6/21 it was 5520, about 49 hours later. I had an ultrasound on sat that showed an 8mm sac with no fetal pole or yolk sack, but the Tech said she thought she could possibly see a yolk sack forming. Do I have any hope or is this it?? This would be my quadruple rainbow… have had 4mc back to back since 2018. Please let me know honestly what you think!!! Have another ultrasound on the 29th and the wait is killing me 😭