Contractions at 31 weeks

This is my second pregnancy at 31 weeks now. I’ve had some Braxton Hicks contractions off and on, usually when I’ve pushed myself too much a given day. Today I had a glass of raspberry leaf tea with lunch, my first glass of this pregnancy. With my son, I started drinking it towards the end of the second trimester and would pound 2-3 glasses a day during the third trimester. Today a single glass gave me some fairly strong contractions! I guess I’ll be laying off the tea for a few more weeks, maybe I’ll start drinking it in week 38 or so. I’m curious why the difference in reactions between the pregnancies but hopefully this bodes well for an easier/quicker delivery this time around!