Would it be misery to get chalazions on both upper eyelids removed at the same time?

They are highly responsive to injection with corticosteroids. The dose you would need for the chalazia is relatively small. There is very little data on the risk of a kenalog injection. There not good evidence that steroids cause preterm labor or preeclampsia. Early in pregnancy there is weak evidence that steroids are associated with clefting syndromes. However you are late in pregnancy. You could wait until after birth or even after nursing your baby. Alternatively, cleared by your obstetrician or neonatologist, localized kenalog injection into the chalazia could be considered but it would be appropriate to wait until after week 32 to decrease the risk of preterm labor.