Biochemical pregnancy

In a biochemical pregnancy, hCG is detected but the pregnancy ends before it can be seen on ultrasound. It is common, including after natural conception. It is a real loss and can be upsetting; it may also show that implantation began.

Also known as: chemical pregnancy, biochemical loss, chemical

Last reviewed: 23 September 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.