In the future I wouldn't press on its body or anything after it eats. The reason you don't want to handle your BP after it eats is because it can press the undigested food against the belly and upset it, which can cause regurgitation. The twitch was probably just a little bit of discomfort. It sounds like your snake will be fine if it made it till today OK.
The best way to see if it's fully thawed is to squeeze the rodent a bit on the skull and on the hip area. If after a second or 2 of holding it you feel cold, let it thaw / warm a bit more. Those are the last areas to thaw during the defrosting process.
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