Probably wouldn’t worry about it but might be best your other half doesn’t actually suck on your nipples going forward. They were likely going to leak anyway from the sounds of it, I always leak after sex & have done since 20 weeks, leaked generally since then. You can collect it if it’s leaking but not express it out if it’s not leaking before 37 weeks.
i asked about this when collecting colostrum and my midwife told me that unless you are predisposed to preterm labour (previous preterm labours, previous early water brakes etc) then it won’t affect you
I wouldn’t worry too much about it , I have a 1 year old who still breastfeeds multiple times a day and night. I read that it’s the oxytocin produced which can trigger uterine contractions however unless at term the oxytocin will never be enough to cause labour x