Feeling sick 36+2 weeks

Marta
Hi everybody,
I am feeling so sick since yesterday night, i started having frequent HB contractions (6/hour) with no pain but latetly i started having chills and a strong bad headache.
I wake up at midnight with diarrhea and i am feeling like this today too.
I also feel pain in back and legs.
Today i dont feel de BH contractions.
It could be a pre labor symptoms?
Thank you