Anyone else?

AF is 10 days late. I have literally EVERY pregnancy symptom and I feel pregnant. Thism will be my second pregnancy if I am. Anyway, AF hasn't shown any sign of coming and I have tested religiously and all negatives. I've read that sometimes in the case of multiple pregnancies that high hcg levels can cause false negatives. Does anyone have any advice or experience with late periods and BFP after multiple negatives??