So this happened twice within the past five minutes and once maybe a month ago..it happens always…

So this happened twice within the past five minutes and once maybe a month ago..it happens always when I'm nursing my baby and when she starting to fall asleep. Her head arms and upper body does this shaking rattle seizure like movement and her eyes kinda roll back, it only last a few seconds but still scares the shit outta me. Anyone else experience this with there LO?! I'm gunna call her doctor tmrw morning regardless just to get ease of mind.