How early did you get your BFP? (DPO)?

Staci Z
I ask because I got my first faint line at 8dpo, so waayyy early. And today I'm 1 day late for my period and my test line is darker than my control line. Could it be twins? 
Also, I'm still testing because I had a chemical last month and I'm too paranoid to stop. Plus I still had tests left. Lol.