I had my last period on 9th aug, I had light bleeding and mucas on 20th aug for 2 days and then nothing, followed by light cramping that has worn off now. I did a pregnancy test and it showed positive. After 1 week of cramping it stopped and now I have brown discharge. I would be due on in the next few days if wasn't pregnant. Is this normal? I am confused, can anyone advise?

Go see a doctor. She would be better able to answer your questions after an exam. Do not totally rely on the test ,there may be other things going on