Question about pre-labour signs for those who already have bubs.

What were you indicators that labour was just around the corner and how long after did you go into active labour? I ask because ive started having basically every early sign basically. Also any ways to stall the baby naturally? I need my son to hold of joining the family till after my partner can get the whooping cough needle. Very important to have it up to date when going to be around a new born with where im from.