Baby in Back.

I swear I feel my baby in my back. This is my second pregnancy and have felt lo move since I was 13 weeks. Now that I’m 17 weeks, I have noticed it on two occasions. You know how you feel your baby ball up? Well, I feel that but directly on my spine. Is this possible? Tell me I’m not crazy. It doesn’t hurt. It just feel just as weird as movement in my stomach.