Babies poo

Heya my baby is 6 months on the 3rd and i have started to change for over to formula from breast milk she is currently having one bottle a day for the last 3 days. She is very very irritated and gassy and will often just keep pulling her legs up screaming (this has been happening since she was born tbh but has got alot worse since the formula). This evening she had a very weird poo for her and was extremely upset and difficult to slettle. I am concerned is to do with milk. Picture in comments I will probably be making a gp appointment tomorrow