SUPER TMI but POSSIBLE PRETERM LABOR?!

Erica • 21. Libra. Bodhi Scott due 1.1.17.
I'm 29+6 days today & ive had a really bad head cold for 2 days, so some mucous has, unfortunately, been swallowed. 
Now I suddenly have diarrhea & am so terrified that I'll go into labor soon since I haven't had that this whole time.
Little to no Braxton Hicks & VERY dull lower back pain, but no different from normal.
I just can't tell if it's me being sick causing this, the apple juice & fish I ate, or if I need to really be concerned.
Anyone else got the poops early in their 3rd trimester? 

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