Talk to Gynecologist on Pregnancy And Delayed Periods

My friend has done intercourse with her boyfriend and she claims that he ejaculated 30 minutes before the sex. They both didnot use any contraceptive and it was normal casual sex for fun. The girl usually has her periods 1 or 2 days up and down the month but it averages to 30 days since the last five months. Her last periods were on 4/3/2025 and today is 4/4/2025 but she hasn’t had her periods yet which is giving her trauma that she might be pregnant. The twist is that the guy didnot cum inside her but rather it was just precum that might have entered. The girl has PCOS and other than normal stress, she doesnot have any other symptoms