No period?

My last post was removed and im unsure why? I didnt get to read any comments so Im re-posting.. I didnt think I said anything wrong? I had gotten the covid vaccine this month and my period is 4 days late (going on 5) Ive never had a late period before so I was curious if it was something that happens with the vaccine? I am not pregnant (I have not had sex in 6 months)