Ahhh I know how you feel, I hate needles... I remember having about 4 or 5 when I was pregnant with my little girl. This time around I've only had to have one so far. I think it does depend on your doctor, and how your health it, i.e whether your iron levels are sufficient. Ask your doctor how many he/she's expecting on doing if you really want to know. It's really hard having your bloods taken, but just don't look, and have your mind on something else and it'll be over quick. I always get queasy when I think about having bloods, its the worst part of the entire pregnancy and giving birth for me.
xoxox