My average menstrual cycle is of 23 days, I had my last menstruation on 19th March and I had unprotected sex on 1st April but I just managed to withdraw before ejaculation and then I took emergency contraceptive pills within 96 hours, is there any chance of getting pregnant? And will there be any delay in my period due to the pill?

There can be a chance of pregnancy simply due to having sex. The emergency contraceptive pills can sometimes alter the next cycle.

You'll need to wait and see what happens when you would expect your next period. If no period shows up, try a pregnancy test. If negative, and for the peace of mind, you might want to try another test a week or two later as well.

Certainly consider a reliable form of birth control to use consistently if you decide to engage in sex. The prevention of an unplanned pregnancy won't be guaranteed, but chances of one will be lower.