I was very cautious and only transferred more than 1 embryo if the second one was going to be discarded and I didn't want it going to waste. I am 40 and the idea of twins terrified me as I know the risks of problems in pregnancy including fetal mortality are raised up to 6 fold with twins over a singleton pg. From my experience IVF is a numbers game and the more number of transfers you do increases your chance of conceiving. From what I have read and spoken about with my FS, transferring more than one embryo doesn't double your chances in a cycle, rather it may increase you chance of a BFP by 5-10% depending on your age and health. However, it also increases your chance of twins by 50-100% if you can get your head around that (ie it is very unlikely that 1 embryo will create twins but much more likely two will create twins). Unlike some FS my FS doesn't recommend multiple embryo transfers even after repetitive negatives and/or if you are older.
For me it is a very personal decision and I always felt uncomfortable for me with the idea of a multiple transfer knowing the risks involved and my desire not to have twins - even after years of infertility I just couldn't cope with the idea of the risk or stress of twins.
Good luck with your decision making.
ETA - there used to be a thread discussing the pros/cons of 1 versus 2 transfer. I will have a look around for you.
ETA2 - sorry had a look around and I can't find it.
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