Hi! 5 weeks probably ain't long enough for the body to adjust. The body doesn't usually get where it is in a hurry so it stands to reason that any uptake may be slow. Maybe put the product name into the search box and see what pops up?
IBS can become problematic as hormones rise and fall, I had sudden need to rush to the loo 10 mins. prior to a bleed, even if a period wasn't due. There was no argument about it, I needed the loo right now! HORMONES
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Mood swings are common too. Maybe keep a diary to chart your feelings, food/symptoms?