My bottom teeth hurt/move. Is that normal? Will I need elastics again or will my class 2 elastics close in the premolar's space?

I've had braces for 8 months. I just got medium Southern Bald Eagle elastics 3 weeks ago. I have class 2 elastics. Finally, I had my 4 premolars removed to create space for teeth movement. ( My teeth were really crowded on the bottom and only one tooth is crooked.) I don't feel or see any movement in my top row of teeth. I only feel movement in the bottom and it hurts (possibly just pressure). Am I doing something wrong?

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