Low HCG

kara
Hello ladies! At my first doctor appointment I was 5w0d. My hcg was 230. Two days later at 5w2d it was 464. My doctor seems concerned and will be doing an ultrasound in 3 weeks. She said it's possible I could have ovulated late or said to keep in mind it may be unviable.  Anyone have any experience with this? This is my first pregnancy and it's such a roller coast!!