8dpo and 6 days away from period

So by like 3dpo I noticed my breasts were very sore. I feel like normally my breasts are sore when I have my period and it's not all the time it's rare. I've also been nauseous and dizzy on and off. I'm 6 days away from my period and 8dpo. I have endometriosis and I'm nervous to take a test this soon. Has anyone had symptoms on 8dpo and taken a test and it come up positive?