Good day everyone! Today I went to the doctor, 39 weeks, no premonitio…

Good day everyone! Today I went to the doctor, 39 weeks, no premonitions ??‍♀️. This is not my first pregnancy, I gave birth at 38 weeks before. The doctor measured my water and said it had dropped, but he says there's no contractions yet, and has scheduled an appointment for next week, which means 40 weeks? Does it happen without premonitions and when did someone give birth unexpectedly, or do all births only occur after premonitions???