Guadeloupe to Dominica Ferry in Feb/Mar weather

Has anyone taken high speed ferry from Guadeloupe to Dominica (and back) in either late February or early March?

Is this ferry trip doable for someone (adult and her 4 year toddler to be exact) who get seasick (with some courage and meds) ? Or the seas extremely rough at all times ?

We can try to book closer to the travel dates based on weather, but not sure if the weather report says its sunny and clear skies all day, it is still safe for someone who gets seasick.

TIA!