Levels of hCG are measured in milli-international units per milliliter (mIU/ml). Beta-hCG levels are low early in pregnancy and rise throughout the first trimester, into the second trimester.

As for how this becomes a chemical pregnancy, Dr Lee adds: "In a chemical pregnancy, BHCG is detectable in the urine, so the pregnancy test is positive, but the blastocyst, for some reason, is unable ...

What can you do to reduce your chance of a chemical pregnancy? The answer to that question, Dr Lee tells us, is unfortunately "very little." Chemical pregnancies are "probably quirks of nature ...