The good news is your body has done this before! Often times second labors are faster because of that (not always, but often). Unless there is a true medical reason to be induced, wait for labor to begin on its own; this will help reduce the risk of another 4 day induction. Your body is probably healthier now that you have lost so much weight (congrats on that!) and that will probably affect labor in a good way too. It's hard when you have an experience that wasn't pleasant (as a labor nurse, I always feel for patients whose inductions span into 3-4 days), but know that just like every pregnancy is different, so is every labor and delivery! Hope everything goes smoothly :)
Are you going to be induced again?
I got induce with my daughter when i was 21 and she was born in 3 hours.
Im sure that once you are in labour all your natural insticts will kick in like im sure they did the first time.
I think everyone worries each time!