Did anyone experience Diarrhea/Loose Stools before going into labor?

I have been constipated this entire pregnancy. I haven't changed my diet whatsoever. But about 2 days ago I started having to use the bathroom a lot more, and it's always pretty loose.  I'm lactose-intolerant and I'm really careful about not eating any dairy when I'm out in public. When I do at home, I take lactaid. There's no reason for this sudden "issue" I've been having that I can figure out. Just wondering if any other ladies experienced this later in pregnancy, or if it was a sign of labor approaching? I'm 36 weeks