Looking for any information if anyone else has expressed colestrum 30weeks plus i realy want to do it this time as it…

Looking for any information if anyone else has expressed colestrum 30weeks plus i realy want to do it this time as it our last pregnancy but not sjre if safe to or not (32 weeks) midwife said everyone have own pinion it just nipple stiumulating that is a worry but wne i troed nipple stimulwtion in last oregnancy he was still late 😅😅