Today is 28 February. You were expecting your call on 24/25 and you had intercourse that day, ie 3 days ago.
If you were expecting your period on 24/25 then you can't get
pregnant by intercourse on that day. If you are pregnant, then it should be due to intercourse earlier.
However, please get your urine
pregnancy test done and consult with me with the report.
Further treatment can be decided.