I am a girl (age 21). last period started on 19 jan 2023. i had an unprotected sex on 24 jan after periods but nothing got inside. but now, more than 40 days have passed since my last period start date and today it is 1 march. please guide n help me?

Normally regular women occasionally skip a cycle or two. If your delay is from pregnancy a urine pregnancy test would be positive by 3 weeks after exposure. Do the test. If menses doesn't come in another month contact your doc.

Stress (emotional, school, work, etc.) can delay ovulation, which will have a corresponding delay on menstruation. Obtain a serum HCG test, which is sensitive to low levels of pregnancy hormone to be certain about pregnancy. Get an appointment with your GYN physician and ask about oral bcp's which are effective contraceptives, and will coordinate your menses.