Can irritable bowel syndrome mess with menstrual cycle?

I have been having issues for 5 or 6 months, my period is never on time anymore like it used to be (usually comes 2 or 3 days later than expected).. just recently got a second opinion from a new GI and he believes that i do have IBS...
Update: It has almost been 4 days since my period was supposed to come and it's still not here... is this bad?
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