Presentation of symptoms with endometriosis is variable. I was always taught that someone with the most severe endometriosis can be asymptomatic and someone with the tiniest amount can have severe pain. The most common symptom is pelvic pain, especially with periods.
When Covid vaccines first came out some hesitancy existed in women planning to get pregnant, despite all the major obstetrical, gynecology, and fertility organizations advocating for it. People would hear about their friend whose period was never the same after a Covid vaccine and freaked out. A recent study in Obstetrics and Gynecology looked into this so we could get a real answer.