Gain in weight and discharge from breasts can occur with /without pregnancy
A disturbance in the hormonal
balance can lead to thos.secondly,there are several medicines which cause this side effect.
You have not mentioned your age or any other associated medical condition you are taking medicines for.
I would suggest you to see your doctor who would helo you out and advice you hormonal tests including serum prolactin
In case you are taking some medication please check with your doctor for side effects acxompanying them.