26 weeks pregnant and given steroid injections to mature my babys lungs, why so early?

No, it's not safe. The steriods help speed the growth of the lungs, but it doesn't mean the lungs are fully mature. There are also other organ systems in your baby that are not fully developed, such as the liver and digestive system.

Your baby is supposed to be inside for another six weeks.

Castor oil just causes false labor that will go away and give you the poos. I've tried it all at one point or another and nothing will make them come before they are ready. Walking is the only thing that has reason to work.

Walking allows baby to put pressure on your cervix causing them to dilate and cause contractions. I would not mess with any of the ole wise tales for now since you are still early.