Sasha is a 1 yr old scottish fold and started having her kittens at around 5pm tonight, she had 4 in a span of about 2 hrs, and none since. I can feel that she has at least one left, and it seems she should have had it by now! Other cats I've had have all had all their kittens right after another, never with this much time in between. Is this ok, or should I do something? Thanks!