I recently visited an ex-boyfriend who is fully vaccinated/boosted. When I visited, I wasn’t ovulating when I visited him according to my iPhone period tracker. It's been 10 days since intercourse and I am now 4 days late for my period. I’ve taken 3 pregnancy tests and they all show I'm not pregnant. No idea what could be going on. I’ve never strayed from a 28-day cycle and 4 day period. Is it possible vaccine shedding changed my cycle? It’s been 10 days since intercourse so I think HCG hormone would have kicked in and shown on a test. I’m very concerned that if I’m not pregnant, my ex-boyfriend who got the three Pfizer vaccines disrupted my cycle. Has this happened to anyone?