From my experience the biggest sign is you. I think only you will know if the IC is working or not. I'll share a mini-revelation I've had recently having done three different episodes in my life of IC. The first one worked magic, the second was useless and the third, which I'm in the heart of right now is blowing my brain away (in a good way).
After some thought I realized what made the first and the third "work" compared to the second was me. In those situations, I wanted help desperately...and when I say desperately, I mean like under water, grasping for air, trying to save my life kind of help. During the second time, I was going to appease someone else and I really (if I'm honest) didn't think there was much point to it.
If you're open, willing and honest in your IC and really set an objective, then it is and will continue to work. Anything else for me is just passing time. Hope it helps.