In general, the breasts do not begin producing milk until later in pregnancy.
There are many factors that can cause breast swelling and discomfort, including the menstrual cycle itself, medications, diet, physical activity, and some illnesses.
If you have developed a new nipple discharge, or a new breast mass, then you should visit your physician and undergo a clinical breast examination.
Sincerely/ Robert A. Wascher, MD, FACS
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