Good Bowel movements

I battle with constipation as long as I can remember.
But then, the last week, it suddenly becomes regular.
The only two things I have been consuming regularly are: A glass of water with apple cider vinegar when gets up in the morning, and a glass of organic homemade yoghurt. This seems to get things moving. Very interesting. Is this a symptom of an onset of miscarriage? My good friend, Tara did mention that the bowel will clear when a birth is due.