Yoghurt and GI issues

For the past two days I’ve experienced stomach cramps like 10-20 minutes after eating Yoghurt. I used organic yoghurt, with organic wild blueberries, local honey & bee pollen. I was wondering whether the yoghurt was causing this because at first I thought it might’ve been from gluten contamination. UPDATE: It’s the blueberries lol but thanks to everyone for advice!