9 month old black poop?

My son is 9 months old I’m a FTM(first time mom) and I’m really worried as his two poop nappies were black in colour? Yesterday he ate a half a sausage and some raspberries and blueberries. He has his normal formula milk Aptamil 2. I have attached a pic I’m sorry for people with sensitive stomachs. He doesn’t have a temperature and isn’t vomiting. Any ideas as to what it might be and the next step to take. I can only contact our personal GP on Monday and could possibly get an emergency appointment tomorrow hopefully or else I need to go to A&E. I wanted to see how it looks in the morning and take it from there.. I just hope his ok..