I believe it can also be a sign of labor, a lot of women get that before they go into labor.. its your body cleaning itself out.
I have a similar problem, I was told it's just hormones! But everyone is different!
Same here 30w1d.. I believe mines a virus cause my two boys now have it!!!
I would call ur dr. Maybe you have a bug??
:-( My diet is already pretty healthy not much junk at all
I'm 38 w and 1d I had the same problem for a few days I talked to my doc and she put me on the BRAT diet and told me to take imodium. That helped me pretty quickly.