And then there's miscarriages: 10 - 25 % of clinically recognized pregnancies end in miscarriage (and 50 - 75 % of chemical pregnancies are also lost this way). (romper.com)
If the level is too low, then the zygote won't implant and you won't get pregnant — this is known as chemical pregnancy or threatened abortion. (momtricks.com)
When my husband I began to start trying for a baby I started charting for about three months and shared my results with my physician — she noticed I may have short - luteal phase defect; which can often lead to frustrating results such as taking longer to get pregnant and also chemical pregnancy miscarriages. (tamietreatment.com)