Women who have had an MRI can have children that month or the following month. Unlike CT exams, which are radioactive and dangerous, MRI works on the principle of magnetic field imaging, which is harmless and safe for the human body. Currently, there are no reports of harm caused by the use of MRI in the world, and it does not cause genetic mutations or increased rates of chromosomal aberrations. If a woman has an MRI for some reason, depending on the timing of ovulation, she can have a baby in the month before ovulation, or in the next month after ovulation, which means that MRI is extremely harmless to the human body and can be used to prepare for pregnancy at any time. Theoretically, if CT examinations are not done repeatedly, the amount of radiation from a single examination does not reach the threshold of harm to the human body. However, for insurance purposes, radioactive examinations should be carefully considered during preconception tests. In addition, women need to have a thorough physical examination before preparing for pregnancy in order to have a good birth and prevent complications during pregnancy.