why do I feel so bad?

Heather
I'm 39+1 weeks with my 3rd child. I had my first at 38 weeks and second at 39 weeks so I thought this baby would come early too. Well I walked a lot yesterday, bounced on the ball, and tried sex as well to see if labor would start. So far nothing but today I feel really bad, like I've came down with the flu almost. I'm so tired, my body feels so weak, and I'm cold. Do you think maybe I just over did it yesterday? Baby girl seems to be moving just fine but I still just don't feel well.