Out of my 4 babies only the second one was truly engaged before labour started. The other three all engaged once labour was established. It also doesn't mean that you have ages to wait either - once baby decides that they are ready to be born they are ready LOL. What position is bubs in BTW? If they are in a less-than-ideal position it can sometimes make it a bit harder for them to get inside the brim properly too. My 4th was still just above the brim at my last appointment and in a OP position - making it harder for him to get in there.