hurt to give yourself the day off! during this time, take care of yourself! have a warm shower, drink some tea, and spoon your heat pack (or 10)!
day 2 and 3 of your cycle is still very sensitive for most, but you might find yourself treating these days exactly the same as day 1. if you really listen to your body and find that you feel better than day 1, why not try and go for a walk? maybe even do some light weight training. this might not be the case for everyone, but if you can do even a small amount of exercise during these days, then you should! 