I transferred 2 last time, still a BFN. I stressed the whole 2WW that I might end up with twins. I have decided to only transfer 1 in the future.
Reason being that each embryo has a chance. If you put in 2 you run the risk of complications that might end your dream due to twins.
The only thing that compelled me to put in 2 was impatience. My theory was that you have 2 chances from one cycle.
But technically I can cycle for each frozen embyro as each has a chance.
If you look at the costs of a cycle vs the costs of raising twins the cycle cost is small and the risks associated with twins are well founded. This is a quote from our clinic information:
If you've had trouble conceiving, the idea of having two babies at one time might seem like a blessing. However, the death rate of twins between 5 and 9 months of pregnancy is 6 times that for single baby pregnancies, while the mortality rate from IVF twins following birth is 4.5% or nearly 1 in 20.
Sadly, deaths do happen. I for one don't want to risk my dream because I was impatient.
Best of luck with cycling,