What do you guys think?

So I’ve been having crazy symptoms. Super super sore boobs, emotional, irritable, fatigued, cramping, heartburn. I’m 8 dpo. Took some first response tests but their all negative. Is there a chance I could still be pregnant? Period is due on the 3rd so we will see. But I’m just wondering if 8dpo is too soon still or if I’m probably not pregnant this month.