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Not to worry. The antibiotic probably has not had any such effect, You are giving typical history of Fibroadenosis
of your breasts. You should show it to the Doctor as medication like Evening Primrose Oil capsules will work well in reducing such pain. Even pull out method can sometimes cause pregnancy
so be careful if you are not planning pregnancy. If you are trying for pregnancy then you can have sex during 14th day prior to next cycle. There is good treatment for your pain, do not delay in getting examined by your Doctor. Eat plenty of fresh fruits and green leafy vegetables. Do regular exercise to keep fit.