First of all it is important to know that whether both the levels of serum prolactin were done from the same lab. In case you are having headache with blurring of vision with a high serum prolactin level and galactorrhoea, a CT Scan head can be done to rule out any pituitary adenoma. You can get a serum prolactin repeated and if it is normal and your complaint of milk secretion from breast has also subsided, you can stop cabgolin. After stopping cabgolin, you can safely plan pregnancy.