<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hello. I am 30, and I had a mammogram and ultra sound today as a follow up-to a biopsy 6 months ago. Everything is fine, but my question is whether I should wait until next moth to try to get pregnant. Would the radiation affect the baby if I do get pregnant?  <response>: Hi, I understand your concern. Radiation affects fetus differently at differently. It depends on the time extent of exposure to radiation. Actually radiation reaches fetus in comparatively less dose, as it goes through mothers body to reach it. - Radiation exposure in first 2 weeks of conception may cause fetal death. - exposure to large dose radiation Like dose received from 500 chest X-rays in early weeks of conception 2 to 18 weeks of pregnancy is hazardous to fetus- it causes developmental defects in fetus-specially brain developments.- leading to low IQ s mental retardation or stunted growth. likelihood to develop cancer in later life. _ Same type of consequences are observed in fetuses between 18 and 26 weeks when exposed to double the dose of radiation. -After 26 weeks baby is fully grown there is no possibility of developmental defects after radiation exposure except for slightly more chances of having cancer in later life. Though no bad effects of radiation exposure of mother before conception are reflected on fetuses, the conception should be postponed, specially when it is a planned conception. It can be easily postponed till next month. Thanks. 