In what stage is it most likely for a mother to suffer a miscarriage?

I think embryonic is most likely..

Studies suggest that as many as 50% of pregnancies miscarry before implantation in the womb occurs. Early after implantation (before a pregnancy is clinically recognized) pregnancy loss rate is around 30%. And even after a pregnancy is clinically recognized as many as one quarter of pregnancies miscarry, usually during the first 14 weeks.

The most risky time is between six and eight weeks from the last menstrual period.

Over half the babies who are miscarried during this period have a chromosomal abnormality.

This occurs when the crossover of genes from the sperm and the egg takes place at the time of conception. Sometimes, some genetic information is lost and the pregnancy cannot

continue. This is known as a ‘chance event’ and has no known medical cause. Exactly which information is lost determines when the miscarriage will happen. The point at which the information is needed, and is not there, is the point at which the baby stops developing and dies, and, usually, the miscarriage begins. This genetic information may be needed

immediately, or not for some weeks, and the pregnancy will carry on as normal until that time.

embryonic and early fetal. Most miscarriage occur before 13 weeks. At 9 weeks the baby is called a fetus,so it would be both.

Most occur with in 13 weeks of the pregnancy due to chromosomes and the fetus