Membranes swept

I just got my membranes swept today at about 3:30..had some cramping after and still am getting little random cramps.. I was 3cm before my dr did it and she told me that she thinks I have more than a 50% chance of going into labor tonight. But all the things I've read if it happens the day you got it done, it's like only 2-3 hours after. I already feel like with my luck it won't happen.