EURUSD LOSS EXPLANATION

So yesterday i took a trade on EURUSD,and as every trader took a loss,so lets try to explain why did a loss happen,as said i took a sell because i saw 0.5 fib being respected and rejected,and my entry was good,but as u see i didnt draw a blue line that hold my price from going down
I should wait for a better confirmation and BOS-Break of structure or some kind of a lower hi,lower low being formed