Any advice

Becca • I`m 19 and ttc with my fiancé of 4 years :) just want our own little family
I have a few questions If anyone who has been pregnant before or is pregnant could help me with. Recently I have been feeling nauseous around late after noon till late at night sometimes morning but more night time, I'm very tired headaches and increased appetite somedays, other days food makes me feel sick. I've took one test so far it was negative but think I did it to early it was on 25/8 ( I inly took test as I was feeling these symptoms) I'm very nervous and just wondering is there a chance I could be pregnant? And when's the best time to take another test? Af due 1/9