High beta HCG levels?

Starlight • Expecting a miracle baby after a long road!
    Hello! I'm wondering if I should start preparing for the possibility of twins. My doctor originally told me I would be no more likely to have twins than the general population, since we were only transferring 1 embryo. But now I'm learning that ICSI/PGS can lead to a greater risk of identical twinning. 
    My nurse said we won't know anything until my 6 1/2 week sono in 2 weeks. We transferred 1 fresh 5-day embryo that underwent ICSI and PGS. Here are my numbers:
 
    10dp5dt - 627
    12dp5dt - 1547