Hi, Im Kathryn I am 18 years old and I'm sexually active. Three days ago I started having some brown discharge from my vagina. Im not sure but I think it smells like blood. The last time I had sex was yesterday and my boyfriend did not use a condom. Are there any possibilities that I might be pregnant? I expect to have my period in a couple of days

Of course there is a chance you might be pregnant if no protection was used.

This may be your period gearing up, but unfortunately you are now in the waiting zone. You need to wait and see if your period comes or not. If it doesn't you need to wait about a week, for the best accuracy, and test using first morning urine.