My mom always told me "When the fruit is ripe, it will drop from the tree." As a mother of three and an experienced Birth Doula and Lamaze Educator I can tell you that my mom was right.
I know you are uncomfortable and I see you are doing all of the "safe" things we know of to encourage labor. But the truth is that there is no compelling reason to rush baby out. Your body is doing a fabulous job as we speak - just think, you are technically almost through early stage (0-3 cms) and are not even in labor yet. That is like being given a 200 lap head start at the Daytona 500!
FYI, with first babies you efface first before you dilate more than a centimeter or two and tend to drop before labor begins. With subsequent babies, effacement and dilation can happen concurrently so it is not unusual to be 3 cms and 50% with your third. The babies also tend not to drop until labor begins.
Please be patient! You will go into labor when your baby is ready to be born. Instead of trying to bring on labor, try doing things to make yourself feel good - walk, sleep, sex, eat great food, see a funny movie, get a mani-pedi, etc. That is waaaaaay more fun than trying to force your body to release your baby!
Congratulations :-)