Can you prevent labour/prolong pregnancy?

Sarah
Sounds like a silly question I know, but I'm seriously wondering what I can do to ensure I don't come early. I'm currently 37+3 and I want to make it out of August (so to at least 38+4) due to many many birthdays at the end of August (I would like to cross over to September which if baby comes when expected I will be fine). I know most first time mums usually go over their due date but everyone I know who's had a baby the last 2 years have come early! Everyone usually asks how to bring labour on but I'm really wanting to keep bubs in there for another week and a bit lol