I'm 25weeks pregnant and having diarrhea three-4 times a day daily for past week. No contractions and not dehydrated. Normal or cause for prelabor concern?

Probably ok, but.. Since you are not really having symptoms besides the few episodes of diarrhea, you should be ok with regard to the pregnancy. But, you have symptoms for a wk or more now, i would check out to see why. Maybe new foods? Meds? Recent antibiotic use? Recent travel? Use of well-water? (concern for giardia). So, consult your doc. Congrats on pregnancy. Good luck.