Comparing Over the Counter Pain Medicines for Discomfort in Crohn's Disease (AVID-CD)

Inclusion Criteria: * Ages 18-44 years * Assigned female at birth * Crohn's Disease (CD) diagnosis * In stable clinical remission from CD, defined as a short Crohn's Disease Activity Index (CDAI; See Table 3) \<150 without use of corticosteroids * Self-reported primary dysmenorrhea * Regular menstrual cycles occurring every 23-35 days * Using an appropriate contraceptive method or abstinence Exclusion Criteria: * Any of the following conditions: endometriosis, adenomyosis, polycystic ovarian syndrome, endometrial fibroids/polyps, chronic pelvic inflammatory disease, a history of pelvic surgery including hysterectomy, any other pathological pelvic conditions, or current pregnancy * Plans to become pregnant during the study period * Use of an oral contraceptive for less than 3 months, on an unstable oral contraceptive dose within the last 3 months, switched from one oral contraceptive to another within the last 3 months or intend to do so during the course of the trial * Taking hormone therapy including estrogen or progesterone that is not part of a hormonal contraceptive * Known hypersensitivity or contraindication to ibuprofen or acetaminophen * Inability to complete REDCap questionnaires (including confusion despite training and/or lack of smart phone and/or computer access). * Not able to speak and read English language.