Beta Hcg & possibly carrying twins?

So my husband and I went through IVF with ICSI (which can increase chances slightly of having multiples). Well we got our first beta which was 1,451 😳 at 12dp5dt 🙊 & then at 15dp5dt it was 3,705!!! 🙈 wondering if anyone's beta hcg has correlated with carrying multiples. Granted, we only transferred one embryo!!! Have had several people mention to wait, our embryo may have split & I may be carrying twins! We have our official ultrasound scheduled Friday the 13 & I just keep thinking to myself- well, it is Friday the 13, anything crazy may happen! We will be grateful and so ecstatic with one (or more) as long as they are healthy. TIA