made up in this conversation A : I have three yonger sister and two brothers,and I looked after them from a young age. I had to be a adult because my parents could not always take off from work in time to be home, it was my job to pick them up from shcool. B:It was greate you were willing to take on the added responsibility. I don't know if I could have been counted on in the situation like that. A :yeah, well, I didn't always know what I was doing, I made it up as I went along. Although I gave up some thing, I got a lot in return, I am really close with my siblings. ...... what' s meaning of " I made it up as I went along" here?