Hi, I had unprotected sex about a month ago and I have been very worried about STD's. The guy said that he was clean and that he previous partner and only partner for the last 6 months was tested but I don't know what to believe. I also went to the Student Health Services at my University for a check-up and they said evrything looks good but to make sure I kept an eye on things. Well, I have been having slight light brown discharge for about 2 days now and I usually get this right before my period but I am not supposed to start my period for another week. Just wondering if this could have anything to do with STD's and if so which ones and what should I do?

Here is an explanation of different types of vaginal discharge : Vaginal Discharge

It sounds to me like it may be old blood, but you can always go to the doctor and have them do an STD test. Better safe than sorry :)

Change in the color, odor or consistency of vaginal discharge may indicate an infection. Yeast infections, where the volume of regular vaginal yeast increases, cause a thick, white discharge that resembles cottage cheese. Other vaginal infections (sometimes grouped as vaginitis) like trichomoniasis and bacterial vaginosis can cause other changes to vaginal discharge, such as changes in amount, color and odor. Sexually transmitted diseases may also be associated with unusual vaginal discharge, but frequently have no symptoms.

In addition, altered vaginal discharge may be the result of personal behaviors or habits that can affect the vaginal environment. These include douching and wearing tight clothing that restricts air flow to the vagina.

Symptoms that may accompany vaginal discharge include painful urination, itching, pelvic pain or rash. Sudden change in vaginal discharge should be reported to a physician, preferably a gynecologist (GYN). If there is infection, it can be treated and the vaginal discharge should return to normal levels