You had Sexual intimacy on 24 March. Your expected date of period was 25 March. You didn't get periods till 26 March.
Please wait for another 3 days before you go for urine
pregnancy test. Unless you had some Sexual intimacy earlier on during this cycle, you can't become
pregnant by the activity you just described. And this was during safe period.
If you are sure that this was the only sexual intimacy you had in this cycle then you can't be pregnant.