My gf is a few weeks late on her period. Took a couple pregnancy tests and both turned up negative. She's not on any birth control and nothing out of the ordinary has happened to her in the past month or so except for the fact that she received the first of two COVID vaccines, and we think this might be the cause. Anyone know of anything similar? Couldn't find much for vaccine and periods, but COVID apparently does fuck with a woman's menstrual cycle and patient accounts are similar (so far) to her situation. This is the best I could find
https://www.medicalnewstoday.com/articles/long-covid-and-periods-the-unspoken-impact-on-female-well-being

Can't find anything anywhere about specifically the vaccine and possible effects on a womans menstrual cycle. Any anons out there who could help me out>