Most women do it when they are full term. It doesn't always work unless your body is ready. And a lot of times it is because the last trimester can be quite painful. But also because they want to avoid a medical induction which hurts more and can raise chances of c section. There's nothing wrong with trying safe home remedies for self inducing as long as you're full term.
Its all the above, but mainly the discomfort, pain and not being able to sleep or move. Once you hit about 33 weeks it starts. But its also the anxiety of not knowing when it will happen. For me personally it discomfort, I cant walk on my own and been contracting off and on since 33wks im now 36+6 and cant wait but not doing much to induce othet than walking when I can and sex again when I can. I may try something more next week or so if im still preggers.
Thanks ladies can't wait for those weeks. (sarcasm)