I'm 4 months on Friday and I was lying down in bed for a good few hours with my hand on my tummy/abdomen and all of a sudden I felt this ball emerge on my right side that slowly drifted off to the middle and while this was happening I felt a pressure like feeling in that area could this be my baby on a little wander or is it something else? I'm a first time mummy

You're at about the right time to start feeling tiny movements. I felt my first movement at 15w6d. Didnt feel quite as you describe though... Felt more like a gentle vibration / popping sensation in my tummy... Like when you have gas bubbles! :)