Dear Nearly There Bump,
The decision to have a C-section rather than a normal vaginal delivery is never made easily. A normal vaginal delivery has the advantage of a more natural arrival into this world and a quicker recovery for you. However a c-section when done early does guarantee the safe arrival of the babies although recovery takes longer after, it has its own complications and it is painful. There are no specific statistics because of all the variables. You are presently on aspirin to keep your blood thin and prevent your placenta from clotting and then not looking after the babies. So your situation has its own risks. I would go with the c-section with the plan that if you went into labour early you could try for a natural delivery. The other option is to try for an induction of labour at the time c-section is planned,but that does have a high failure rate and can be painful still ending up with an operation.
With your age, twins and the risks that go with that, then add on the aspirin factor I am with the obstetricians. You are so nearly there, so what for a c-section ! Just get on with it and enjoy the babies once they are safely out.
Dr Winstanley © 2013