What does it mean if i have a thick white discharge tender brests and pain in my midsection all the way around and occasionally up my spine.

Lactating breasts: could mean either pregnancy or hormonal imbalance. I would make sure to check a pregnancy test, then if negative check it again 1 week later. You do not want to have a pregnancy and not know it. If everything is negative, then you have irregular bleeding from cycle and may need to see a GYN to regulate it again, especially after 3-4 months of similar bleeding.