If pregnancy endangers your life
Life-threatening implies that the continuation of the pregnancy will endanger your life, even if this possibility is not immediate.
Only you can and should decide what risk you want to take and to what extent you want to take it. No one can force you to take unnecessary risks.
Your doctor is obliged to offer you a termination of pregnancy if he or she diagnoses that your life would be in danger if the pregnancy were to continue. For example, in case of severe preeclampsia.
Remember that your life must always be prioritized, therefore, there is no time limit to terminate the pregnancy and avoid putting yourself in danger of death.