You are now TTC and devoid of contraceptive
pill for last 2 yrs.
Now present with brown & pink blood with negative pregnancy test. It may be early implantation
bleeding or old uterine blood.
Do a USG for pelvis to rule out the underlying pathology.Then consult with your gynecologist.
Also need some investigation like hormone profile,ovulation test,tubal patency test etc including Fresh Semen Analysis
of your husband for evaluation of infertility
Do unprotected sex around ovulation time for highest possibility of pregnancy.May use Ovulation Kit to predict your ovulation time.
Take healthy diet,avoid stress,do regular exercise and proper sleep along with Vit-E supplements.