Let me be sure I understand what you're saying before I try to answer.
You did IF twice last week, got on the scale, didn't see massive instant weight loss, then you did a mondo IF yesterday - complete with workout, and you got on the scale today and still didn't see any massive instant weight loss?
If that is what happened and what you are looking for, you might want to notch it back a bit. Slide that scale up under the bed or lock it in the garage for a month before pulling it out again. IF can be fairly quick acting on your blood sugar numbers and insulin resistance and other metabolic effects, but yeah - it's not going to drop the scale out from under you.
Weight loss is made easier with IF, IMO, but easier doesn't necessarily mean faster. And I only think it makes it easier by helping to bring your metabolism back around to where it is functioning optimally.
YMMV - Maybe someone else knows better, but that has been my experience with IF.