Milk,colostrum,39 weeks, labour

Jennifer

I’m 39 weeks and 1 day, I attempted to use my breast pump today to see if it brings on labour for me. As I was pumping, some clear, yellowish liquid came out which I’m assuming is colostrum. Does anyone know if I can try to express this and freeze it? Or am I best to stop pumping so I can save it for baby!? Also anyone had any success with using a breast pump to start labour?