Any one been on the mckenna shots to help prevent early labor? My son wanted to come at 29wks I was dilated to a 2 and 80% effaced. the drs were able to stop it I had him at 34wks. I got pregnant again 9 months later (3rd baby in 3 years) and they started me on the mckenna shots at 16wks (every week til im 36wks) to hopefully help not go thru what i went thru again... My question is how did it effect your labor? How soon after the shots did you go into labor? Does it make you slow down the laboring process? Thanks in advance