I took a pregnancy test; it's negative, my period just went off but i have mild discharge, headache, nausea, sleepy..what is it?

Not pregnancy: It sounds like you're sure you're not pregnant. The discharge may be normal, but if it isn't your usual, you would want to rule out vaginal infection with your doctor. Otherwise i would be looking for things like a viral illness, low blood sugar or food sensitivities as causes for your other symptoms.

Vaginal discharge: Vaginal discharge requires an examination to determine the cause and treatment. Bacterial vaginosis is the most common cause and often has a vaginal odor. Vaginal itching can be a sign of a yeast infection. Sometimes vaginal discharge can be a sign of a sexual transmitted infection. Testing is important to determine the treatment and keep you and your partner safe.