Can a pcos woman get pregnant while breast feeding? If she got pregnant will breast feeding stop? What about a normal woman?

Yes. If you are ovulating you can get pregnant. Women with PCOS ovulate less frequently and breastfeeding if done exclusively ( no pacifiers or supplements at all) does suppress ovulation for awhile. Pregnancy doesn't necessarily dry up breast milk but it is very difficult to get enough nutrients to feed one baby while growing another. Hope this helps.