Sign of chemical pregnancy...again?

Just started seeing faint lines at 10 & 11dpo. My line seemed slightly darker this morning that yesterday but with all the excitement of that, I'm just now realizing that my sore breasts are almost gone. I've had chemical pregnancies in the past and am now fearing I'm going to have yet another. Anyone else have disappearing symptoms so early (before missed period) and the pregnancy still turns out to be okay?