My lmp was the 19th of august also, i ovulated september 3 so i am now 7dpo, depending on when you ovualted thats how many days post ovulations you would be. Normally implantation dont happen until 6 or 7days
post ovulation. Sometimes if it occurs early, something could be wrong. Also i heard yellowish discharge could mean pregnancy, in some situations, yellow could mean mucus plug is coming out and end in a m/c. It could mean a few things, but your early in the stages for it to mean m/c.