Hello ? girls, who have given birth more than once, tell me, can they …

Hello ? girls, who have given birth more than once, tell me, can they start on their own, earlier than in the previous pregnancy? Or is it related to the fact that I drink coffee (one cup a day (240 ml) with milk)? In my previous pregnancy, pre-term contractions started at week 35. This time, it's kind of unexpectedly early. On the internet, they say that pre-term contractions are usually painless ? well, I laughed about this, of course.