possibly pregnant?

I am 8dpo. i took a test this morning and got a very faint line, but when i checked the test about 15 mins later it was completely gone. I’ve been having a lot of headaches, nausea, fatigue, sore and heavy breasts with tingly nipples, also feel like my cervix is high when i felt it. Also, my mood swings have been all over the place. I’m trying not to symptom spot but this is all so bizarre i don’t know what to think! my next period is due in 5 days