pooping a lot before labor tmi

I’m 39 weeks now and (tmi) the last 2 or 3 days I’ve been having to poop a lot more, when I’ve been so constipated the last 8 or 9 months. I was 1 cm dilated on Friday and now suddenly this. has anyone had to poop a lot before going into labor? And if so, how soon before did it happen? I really hope it’s happening soon