It is important to evaluate the risks and benefits of treating migraines with a medication like a triptan during pregnancy, especially if the migraines are severe. Sumatriptan is one of the older triptans and has more data available regarding its safety in pregnancy compared to other triptans. It does not seem to be associated with major birth defects, miscarriage, preterm birth, or low birth weight, but it may slightly increase the risk of uterine contractions at high doses. If possible, switching to sumatriptan would be ideal. It is also considered safe during breastfeeding as it passes into breast milk in small amounts with no reported side effects in infants. It would be best to discuss this with your healthcare provider.