A little TMI

Might be a TMI but all well. So since 30 weeks I've been constipated I was lucky if I wanted to go twice a week. Which got worse when I had to start taking Iron supplement. Now for the past day or so, it seems I need to go like 3 or 4 times a day. I read that you might experience loose bowel movements when labor is near. Is this true could labor be in the near for me?