Low progesterone can easily lead to miscarriage because after pregnancy there must be enough progesterone to maintain a normal pregnancy. If the ovaries are not functioning well, that is, if the corpus luteum is not functioning adequately, it will not produce enough progesterone to maintain a normal pregnancy. However, if the embryo itself is not developing well and is not able to effectively stimulate the corpus luteum to produce progesterone, this can also cause a decrease in progesterone. If the progesterone is lowered due to poor luteal function, progesterone can be applied to preserve the fetus, and if a fetal heart and fetal bud are seen, it means that the pregnancy is successfully preserved. However, if the progesterone is low and you still can’t see the fetal heart and fetal bud or bleeding after applying progesterone, it is possible that using progesterone to preserve the fetus is also ineffective, mostly because the fetus itself is not developing well and can’t effectively stimulate the corpus luteum to produce progesterone, which is also a natural elimination method and the preservation of the fetus will not be successful.