am i pregnant?

okay so my ex and i broke up last week and we had sex, protected and un protected but the last time we had sex was on my period and he’s never cum inside me? and so 5 weeks later i’ve felt nauseous all week and i’ve lost 5 pounds in 2 days even tho i’ve done no exercise in the past week, also today i had brown discharge i did some research and some said it was normal for 9 days before a period but others automatically said it was bc i’m pregnant so i’m not sure and i’m really freaking out!! so do you think i’m pregnant?