too early for blood test positive?

Layli • I am 21, my SO is a wildland firefighter, we are pregnant with baby #1 and I have 2 gorgeous step kids. I have stage 4 endometriosis and PCOS.
I am 14 dpo and I have had light spotting for 2 days as of the 18th, I have sore breasts with veiny nipples, nausea, and light cramping plus food aversions. Had an HCG test today that was negative. Too soon for a positive?