Hi ya. When I first started I got tummy pains but I think mine was just due to having all this extra fibre I wasn't used to and was trapped wind.
If you think it's trapped wind you can try a deep massage on ur tummy to release it, or I find laying on my tummy on edge of the bed helps. Failing that you could have an intolerance but obviously this depends on other factors too (I'm intolerant to eggs).
Hope this helps in some way. X