Tobily the bladder shows as an extra little bulge just above the pubic bone especially during contractions. The woman was lucky, it can be very dangerous. Aside from blocking the baby's descent, it can also cause a ruptured bladder, which is a life-threatening situation requiring immediate surgical intervention.

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Wow hoobley that's really interesting. With the amount of urine that come out I also wondered if there was a risk of injury to the bladder, the mum did say that she was having trouble for about 36 hours afterwards and I thought it may have been a bit injured or bruised.
I hadn't heard of it actually rupturing though it makes total sense when I think about it. Eek.