Hi A.,
Be patient!!! I know easier said then done! :-)
Inductions don't always work the first time. I've seen some go through 3 days worth of Pit. Your body is not ready yet. Check out a website on Bishop's score. It will explain some things such as cervical changes your body needs to do in order to respond better to the induction. That is not a for sure induction either.
You didn't give a due date, or reason for induction. Obviously not medically needed, otherwise you would have had him one way or another.
I have heard castor oil works, but I would not recommend it. It may be miserable for you & could be messy!!
If you & baby are doing OK, & you're not way past due, continue to try the natural methods. Trying to force an induction when your body is not ready could be long & miserable. It could also steer you down the c-section route, especially if they break your water & you don't progress, so be careful.
Patience is the best way to go as long as you're both OK.
Good luck & Congratulations!!!
K. :-)