No signs ahead of time?

Have any moms gone into labor without any warning signs? I'm 37 + 2, and have not had one contraction, any discharge/mucus, absolutely nothing. I feel totally fine and the same as I did 7 weeks ago.....I'm not "over" being pregnant, I don't mind being pregnant it's not like I want her out now, but it seems like there is no end in sight. I'm just worried my body isn't working properly and I'll have to be induced at 42 weeks (I really want an all natural birth).