Pregnancy During Chemotherapy: Is It Safe?

New Delhi, 19 July 2025: Pregnancy during chemotherapy is a rare but possible situation, and it raises several questions about safety, treatment, and the health of both the mother and the unborn baby. For women diagnosed with cancer during pregnancy, navigating treatment while protecting the fetus becomes a delicate balance. So, is it really safe to undergo chemotherapy while pregnant? Here’s what medical experts say.

Is Chemotherapy Safe During Pregnancy?

The safety of chemotherapy during pregnancy largely depends on the timing. Doctors generally avoid administering chemotherapy during the first trimester — the first 12 weeks of pregnancy — because this is when the baby’s organs are forming, and the risk of birth defects or miscarriage is highest. However, chemotherapy is considered relatively safer during the second and third trimesters when the baby is more developed. In these later stages, certain chemotherapy drugs may be used with caution to treat cancer without harming the fetus.

What Types of Cancer May Require Chemotherapy During Pregnancy?
Some cancers that might be diagnosed during pregnancy include breast cancer, cervical cancer, lymphoma, and leukemia. Treatment plans vary depending on the type and stage of cancer, the overall health of the mother, and how far along the pregnancy is. Multidisciplinary teams involving oncologists, obstetricians, and pediatric specialists usually work together to ensure both mother and baby get the best possible care.

What Are the Risks?
Chemotherapy during pregnancy carries certain risks, such as preterm birth, low birth weight, and temporary low blood counts in the newborn. However, research and clinical data have shown that many babies exposed to chemotherapy in the womb after the first trimester are born healthy and without long-term complications. That said, each case is different, and treatment must be tailored individually.

Can Pregnancy Affect Cancer Treatment?
Yes. Pregnancy can limit some diagnostic tests and treatments such as radiation therapy or certain medications that might harm the fetus. This means that in some cases, treatment may be delayed or modified. For example, some surgeries might still be performed during pregnancy, while others may be postponed until after delivery.

Should Pregnancy Be Delayed If Undergoing Chemotherapy?

For women already undergoing chemotherapy for an existing cancer diagnosis, becoming pregnant is generally not advised. Chemotherapy drugs can affect fertility and may also harm a developing embryo if pregnancy occurs during treatment. It is essential to use effective contraception during chemotherapy and consult a doctor about family planning after treatment is complete.

While pregnancy during chemotherapy is not without risks, it is not necessarily unsafe — especially if managed carefully under expert medical supervision. If cancer is diagnosed during pregnancy, many women can still receive life-saving treatment while delivering a healthy baby. The most important step is early detection, timely diagnosis, and working closely with a qualified healthcare team to make informed decisions that prioritize both maternal and fetal health.