Maternal C - reactive protein levels were assessed from archived maternal serum specimens. (sciencedaily.com)
In fact, however, 2 infants, reported to have side effects possibly caused by fluoxetine in breast milk, had serum levels slightly below4 and somewhat above3 typical maternal serum levels. (pediatrics.aappublications.org)
You still have ultrasounds and can go for maternal serum tests if you want. (pregnancy-info.net)