Braxton Hicks...when did they start for you?

Samantha
What week did you twin mamas start getting BH contractions and how often? I've been having them literally every single day since 26w and I am 28+4 now. Is that abnormal? I time them and keep an eye on things but really why do I have to suffer every day??? I'm thinking it probably doesn't help that I'm measuring 42w either. Just wondering about everyone else's experiences.....
Just adding this in, I drink 3 liters of water a day so I'm pretty sure it's not a dehydration problem.