How many of you...?

Hello ladies! Just curious...

I'm expecting baby #2, to make a long story short I am expecting him any day now (currently 36+4 but measuring between 37/38cm and have a size estimate ultrasound for this friday).

I would just like to know how many of you have been in labor and not knew it until the baby was "RIGHT THERE!"? What symptoms did you have that you weren't aware of at the time?

I am somehow more nervous this 2nd time around than I was with the 1st! I have this nagging feeling that I will not realize I am in active labor until it's too late with my 2.5 year old and I here by ourselves.

Please share your stories, I am not sensitive to TMI so share away. Just need to know all of the possibilities.