A sign from my angel?

I was just thinking about all the time my son could have been delivered and have been fine.  He passed at 39 weeks, 6 days.  All the appts I went to during this time, all I needed was some intuition to tell them to get this baby out now!  Well, I then heard this loud lip smacking sound on my right side.  It was pretty loud, like it was right in my ear.  I asked my coworker behind me if she heard it and she didn't.  I hope this was a kiss from my son.  I know most likely there's an explanation for it, but I am really hoping it was him, especially since I've been feeling really guilty lately that everything was not done to save him.  He is my little boy, we spent 9 months together, I miss him so much.