Nausea before labor?

Megan
Ok, so I am 38 weeks pregnant and have been having contractions on and off for days. They will come at regular intervals, about 5 minutes apart usually and are painful enough that I can't walk through them. Then they taper off. Also have been having 2-3 loose bowel movements a day for the past three days. Baby is very low in my pelvis and I am beginning to dilate.
I have posted about this before, but tonight I got VERY nauseous all of a sudden and felt shaky and horrible. It lasted about an hour and then mostly went away. I thought I ate something weird, but it wouldn't have gone away like this if that was the case. I have also had a nagging back ache all day and keep feeling like I have to go to the bathroom (bm) but then nothing happens. I have read this nausea/sick feeling can be a sign of labor. Anyone experience anything like this before labor began?

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