Does the Plan B pill also cause breast pain and altered vaginal discharge coming out?

Possible. Plan b is a progesterone. Progesterones can cause breast pain (especially nipple pain or irritation). Progesterones also cause a thickening of cervical mucous which can affect the nature of your vaginal discharge.
Maybe. Typically it does not cause breast pain but it can bring on your period early or cause thickening of the cervical mucous. It doesn't ever cause any kind of infection or a change in your vaginal discharge for long. If you needed Plan B once, go get on better birth control.

Related Questions

My breasts hurt and I have vaginal discharge but test neg what does this mean?

Hormonal Fluctuation. It is common to have hormonal fluctuations that cause pregnancy like symptoms. If you missed your cycle and have tested negative, repeat test 1 week after you were due for cycle. If symptoms persist, see your PCP/GYN. Read more...

I am 50 and am having breast pain mostly left since 6-7 months. What can be the reason? My periods stopped in April 2013.with white vaginal discharge

Exam. Get a breast exam, mamogram and breast ultrasound. Wear an athletic bra: no underwire- but certainly get examined. Read more...
Breast Cancer. Although atypical for breast pain, chornic pain that lingers can be a sign of cancer. See your doctor to get a clinical breast exam and mamogram. An MRI or ultrasound woul dbe warrented if the symptoms persist even in the presence of a normal mamogram. Read more...