According to Yahoo answers, each vial is about 10 ml of blood, so you can figure it’s about 30 ml altogether. We have about 5 liters of blood in our bodies, so it’s obviously just a tiny bit. When a person donates blood, it is about 1/2 liter (500 ml), which is more than 10 times that amount. The “weakness” people refer to is probably the drop in blood pressure experienced from a vasovagal reaction, which, according to Yahoo Answers, is very common. It’s caused by activation of the vagal nerve, which causes a drop in heart rate and blood pressure. Like others said, drink some OJ and eat a few cookies. Maybe you should be one of the first so that you can rest for an hour or so afterwards while the other girls are having their blood taken. You should be fine by the time of the chassanah. Also, I don’t recommend looking at the needle when they put it in or while it’s in your arm. That’s the part I don’t like.
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