Lactation, but not pregnant?

I noticed that my girlfriend have recently started to lactate during foreplay. However, she took a pregnancy testing and it came put money on negative. What could impose this? She has an appointment for the doctor, but I considered necessary to see if anyone else had this start. She is not on birth control nor does she take any medication.Lactation, but not pregnant?
She will have bloodwork done to check her prolactin level. They will more than likely be elevated, and later she may be sent for an MRI scan to check her pituitary gland.
I went through lactation in need pregnancy back contained by '05. My prolactin levels be up, my gyn sent me for the MRI, which showed a small tumor on my pituitary gland. Rest assured, this is something benign, completely harmless. In some cases a medication is needed to lower the prolactin level, however, in my suitcase, it went down on its own.
She should see her doctor. If for no other motivation, for her annual check up and she can mention the lactation to him/her.
It could just be regular hormonal change or it could be something more serious. Here is a link to a breast vigour website that has a great deal of information and descriptions of various types of nipple discharge. I hope this help and gives you adjectives a bit more information before she see her doctor:
http://www.imaginis.com/breasthealth/nip...
I know plenty of girls who have be screwed over by faulty pregnancy test so you should get her to the doc right away, and if she is preggers plz step up and the father! dont simply give ur sperm! and plz dont enjoy an abortion, my mother was forced to hold one by a controlling/abusive husband and she regrets it everyday of her life.