Chemical pregnancy is known as the early pregnancy loss which occurs after the short time period of embryo transfer. On an average of 50%, the woman who is conceiving her first baby can end in a chemical pregnancy. It usually turns into a chemical pregnancy due to certain chromosomal abnormality in the embryo. It can be also due to the hormonal imbalances and clotting in bloods.
IVF can at times lead to chemical pregnancy. Some of the common causes of chemical pregnancy include abnormal hormonal levels, poor uterine lining quality, and implantation of fetus in the fallopian tubes or areas outside uterus. During my wife's first pregnancy, the embryo got implanted in the fallopian tubes which ultimately failed. The next one was successful.