I’m writing to explain a concern regarding my girlfriend’s menstrual health. Her period has been delayed by 5 days, which is unusual for her as she typically has a regular cycle. We have had protected sex, always using protection correctly and carefully. To be sure, she has taken two home pregnancy tests, and both were negative. She also experienced vomiting once, which added to our concern, although she has no other major symptoms. Given that her period has never been this delayed before, we are feeling anxious and would appreciate your advice on what steps to take next. Could this be due to stress, hormonal imbalance, or another underlying issue?