Pregnancy question

Okay so my breasts are super swollen, super sore and my areoles are darker than normal, I've had lots of head and back aches, been going pee very frequently and I'm extremely tired. Obviously based on symptoms I would think I might be pregnant the only thing is I don't start my period until the 20th. I will be nearly a month if not more pregnant at the point when I miss my period. Is there any test that would come up positive before I miss my period I took a clear blue digital but it came back negative but then I read someone post about how sensitive those test are. Idk what to do... Any help or advice is welcome! Thank you!!