I'm asking about you and only you, not the total in the bed, but pillows that are claimed and used by you.
That means your partners pillows don't count.
I use long body pillow. It's perfect, because it's big enough for my head and my cats to sleep on other side of my head. Haha! I use to sleep with two fluffy pillows, but I started having back problems. so I switched.
3 technically. One for my head, one between my knees, and the body pillow tucked between my boyfriend and me. He used to end up leaning on me in the middle of the night (he's much bigger than I am) and I would wake up sore. Now, he uses the pillow instead. I sometimes snuggle up to it as well, so I included it as one I use.