Your hCG levels start to increase rapidly as soon as a fertilized egg implants in your uterus. This usually happens about 10 days after conception. During these early weeks of pregnancy, you may not show any outward signs of being pregnant and you may not even suspect that you're pregnant.

How long does it take for hCG to show up?

The hormone hCG is manufactured by the placenta and first appears in your urine anywhere from 10 to 14 days after fertilization.

How long after implantation does hCG rise?

The levels of hCG doubles every 48 hours after implantation. So, if a woman experiences implantation bleeding, then it is better to wait for four to five before taking a blood test for accurate results.