Next generation sequencing (NGS) was available in 10 pregnancies and revealed additional somatic mutations in three: an ASXL1 mutation (G1397S) in a case with JAK2‐mutated polycythemia vera (PV) and a different ASXL1 variant (N986S) in a case with JAK2‐mutated ET, both of whom had full‐term deliveries. Here, JAK2 is linked to essential thrombocythemia.