Welcome to HCM.
You tried to conceive and you got very light brown bleeding from 17th to 21st July with very faint positive pregnancy test.
Bleeding is probably due to early implantation
or hormonal imbalance. You may do a blood test
for HCG for confirmation of pregnancy along with a USG scan for evaluating underlying pathology.
Do fresh hormonal study like LH/FSH, Estrogen & Progesterone
level,thyroid profile,blood prolactin along with blood group
& Rh typing for both.
Check the test results and consult with your doctor.
Take healthy diet rich in protein, Vit-E and other nutrient supplements with folic acid. Avoid stress,sleep properly and do light exercise everyday. All these increase fertility and pregnancy rate