with baby number 2 i was induced when he was 9 days overdue.
When they did the internal to insert the gel, they discovered that i was 1 cm dialted, so they decided not to do the gel, as thats to start dialation, they broke my waters, and started the contractions via a drip, once the contractions were established they turned off the drip. My labour was 5 hours long.

Hth