Implantation occurs on average, 9 days after ovulation (with a range of 6-12 days) or about 5 days before a missed period. hCG levels are detected in the blood as early as 2-3 days, and in the urine 3-4 days, after implantation.. Beta hCG Levels Twins Chart Exclusively explained for pregnant women. HCG levels is a Good sign to expect if you’re having twins, triplet, or any multiplet. Human Chorionic Gonadotrophin Hormone (hCG) is a unique pregnancy hormone. It is the hormone which is detected early in the blood and/or urine of a woman who is pregnant. Next is valuable detailed data to help you calculate hcg levels . hCG Level Information Human Chorionic Ganadotropin (hCG) is only produced during pregnancy. It is the hormone that home pregnancy tests look for as well as blood tests at the doctor.. Quantitative (reported as a number) hCG testing (also called beta hCG) measures the actual amount of hCG present in the blood. It may be used to help diagnose an ectopic pregnancy , to help diagnose and monitor a pregnancy that may be failing, and to monitor a woman after a miscarriage.. Average Beta hCG Values by Pregnancy Week/Day as submitted by our members during their pregnancies.. Beta hCG is considered a , which means it’s a substance that’s excreted by some kinds of tumors. That’s why, in some cases, the hCG blood test may also be used to evaluate and manage certain .