I feel you, stress is a terrible trigger for me, too. 🙁 I do sometimes get cramps in my lower abdomen right before or during a flare, but not pelvic pain. I've found several articles that mention pelvic pain as a common symptom though, for example these:
https://irritablebowelsyndrome.net/symptoms/non-gastrointestinal-digestive-symptoms-of-ibs
https://irritablebowelsyndrome.net/living/digestive-issues-sex
It could also be a symptom of something else though, like endometriosis:
https://irritablebowelsyndrome.net/living/endometriosis-symptoms
As Kelly said, I'd definitely talk to a doctor about this if you haven't already.
Hugs, Karina (team member)