My opinion is that women have the right to make decisions about their bodies. Medical practitioners are obliged to give clinical advice, including the risks and benefits of all options, and then do what they're asked to do.
There are no absolutes. There are always risks. Those risks are ours to bear. You can never know what things might have been like if you'd done it differently, you can only guess. Confidence in yourself, the information you've been given and your carers will reduce the likelihood of regrets later on.

Statistically speaking, the normal gestation for first time mums is more like 41+ weeks, not 40, anyway.