early sign that labor could be around the corner..?

Sorry for the weird tmi question, but is pooping a lot a early sign that labor could be around the corner or within a week? I'm almost 37 weeks. I'm always constipated. I've had problems with that my whole life. I've had to take miralax every night my whole pregnancy (doctors orders) to go regularly. But I don't always do that. I haven't had it in a week or so, and I've been pooping like CRAZY the last couple of days????