How to keep him in there!?

Kitty • Living with PCOS. Mom of THREE boys Jayden💙Ethan💙 Logan💙
My 1st born was born at 37wks
He had a few complications 
Nothing too serious 
I'm trying to make it to 40wks this time around "yes I know baby determines when and where and it isn't up to us" but what are some tips of keeping this little one in there?! Lol
With my 1st I wasn't as active as I am with this one. And with my first the father and I actively had sex and this time around I'm single so sex is out the picture. Lol so what other stuff should I NOT do to slow this process down lol "I know people are usually the opposite and want baby out already" lol 
Help me