Hey, I've given blood a couple of times though I haven't been able to in awhile due to piercings, tattoos and travelling. They should check your blood pressure and your iron levels prior to make sure that on that day at that time you are medically able to do it. Either of those times should work for you because you should be able to eat a proper meal before hand. I'd recommend eating a bit more than normal. They are pretty good with watching you to make sure you aren't going to pass out or throw up, especially on your first go.
I'd say go for it. It's an awesome way to give back, so many people need blood, it's pretty painless and takes hardly anytime.
Good luck.
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