The use of contraceptive may cause fluid retention and, consequently, a sensation of nipple strain and breast augmentation. This is more likely to occur during the use of contraceptives containing estrogen.
The sensation of enlargement in the breasts should not be an impediment to continuing the use of contraceptive. Usually, this situation is adaptable after the first few months of using the medication.
If this situation is troubling you, consult your GP, family doctor or gynecologist to discuss a possible method change or contraceptive medication.
Does Contraception make breasts swollen?
Does birth control gain?