I had frequent sonos with my daughter, I waited until the dr ok'ed me to start working on things to induce me. I started at 38 weeks trying to induce
I started using a birthing ball at 38 weeks and then walking at 39.
Hey I don't know when a safe time is but I was told that pineapples have the same chemical doctor uses to induce you. A friend of mine was a couple days past due and tried it. She ate a whole pineapple and went into labor 2 hours later.
Id say its best to wait till 38 weeks baby should be perfectly healthy I see alot of ppl start stuff at 37 weeks but thats almost a month early plus dates could be off so itd be even sooner (raspberry leaf tea not includef its just supposed to tone ur uterus) but no method is going to MAKE baby pop unless already really close