How many eggies??

Met with Dr. Dudley last week and signed consent forms, discussed what to do with frozen embryos and how many eggies to implant. This is a tough one----we have however, decided to definitely do two with a 3 day transfer. But the difficult part is the 5 day transfer- apparently a higher success rate of implantation and higher quality embryo (blastocyst at this phase).. So..they really recommend transferring one to avoid multiples (not excited about carrying multiples) but if I transfer just one- what if one doesn't make it. 1-1=0 (I learned this in grade school) But if we decide to transfer two and one doesn't make it 2-1=1 (see how smart I am)... But conversely- since we are using "young" eggs and our donor already has proven fertility (2 children herself)- 2-0=2 (not exactly a good idea considering my history of hypertension in pregnancy- NICU time and sick babies doesn't make me happy either) OH- and here's another arithmetic factor to also consider- the rare but occurring splitting of one egg (identical twins) 2+1= 3 (definitely a NO NO)...
Big sigh---what to do....what to do....