Help. Not sure if I'm pregnant or not.?

Okay well I'm 15 and I'm confused. I am late for my period this month by about 4 days and lately I've been having really abd white discharge that feels like my period. I had like brown discharge a week ago that lasted for 4 days. I'm on anti-depressants and also have a lot going on in lifw. Me and my boyfriend have used condoms. But yeahh. I have sore but that's about it. Any possabilities?