Yes, but only if I miss or delay a dose. I take sublingual pills every 12 hours. When I take them on schedule things feel normal. If I forget to take them, I start to feel uncomfortable around 1h30m to 2h later. I become anxious and uncomfortably hot. I feel relief at that point because taking the late dose stops some specific unpleasant feelings.
In response to your questions, I don't think feelings are an accurate way to assess dosages. You have no way to consciously feel your own hormone levels directly. Every feeling reported in this thread is a second or third order effect of the hormones which is neither precise nor timely.
I had C cups at 4 months. Not implausible.