If breast cancer is in your body during pregnancy, it cannot spread to the baby. This is because a barrier between the mother's and the baby's body blocks any cancer cells from entering the baby or its blood supply.

Hormonal therapy will normally not cause birth defects. Howeve,r it should be noted that Tamoxifen is not considered safe to take during pregnancy. So if you're trying to get pregnant, or you think you might be pregnant, you should not be taking Tamoxifen.

Depending on the stage of the cancer, some pregnant women with breast cancer may need chemotherapy.  Most breast specialist doctors do not give women chemotherapy during the first trimester (first three months) of pregnancy because it could harm the organs of the fetus that are developing during that time.  Hence, a women diagnosed with breast cancer during her first trimester may opt to delay starting chemotherapy until she starts her second trimester. 

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