Since the value of elevated hcg levels after pregnancy varies greatly between individuals, the range of normal values is also large and there is no fixed standard. On the 14th day after successful embryo transfer, just after the fertilized egg has completed implantation, which corresponds to the 4th week of pregnancy, hcg levels may fluctuate between 500 and 10,000. The increase in hcg levels in twin pregnancies is more pronounced than in singleton pregnancies, but there is no fixed standard. To evaluate whether the hcg level is normal after pregnancy, it is necessary to repeat the test several times after every other day and compare the results according to several times. As long as the hcg level increases at the rate of doubling every other day, it is normal, and if it doubles poorly, it is considered that the embryo is not developing well.