Can I still get pregnant after having sex yesterday and getting an abortion tomorrow?

Plan B is most effective when used as soon as possible after unprotected sex — preferably within 72 hours. It prevents pregnancy by postponing ovulation. However, it is essential to remember that it is not 100% effective. If you miss your period or notice any unusual symptoms, make sure to take a pregnancy test. 

Yes, you can get pregnant having sex 3-4 days after your period. Sperm can live inside your body for up to 5 days..and if you ovulate earlier than usual, say, in a 25-day cycle, the chances of pregnancy are even higher. Always use contraception unless you're trying to conceive.

Feeling worried after unprotected sex is normal. Anxiety is common in this situation. Emergency contraceptives like the 'i-pill' are most effective within 72 hours. Side effects like nausea or dizziness may occur but usually pass quickly. If you're unsure, taking the pill can help prevent pregnancy.

When the contraceptive pill is taken correctly its effective in preventing pregnancy.. but there is still a small chance of pregnancy even if ejaculation doesn't occur inside the vagina. Take a test to confirm

Yes, it's possible to get your period even if you have sex during your period. Getting your period is a natural part of the menstrual cycle, and it can occur independently of sexual activity. 

It's completely normal for periods to be late sometimes even if you have used protection. Common causes could be stress, a change in routine, or hormonal imbalance. If you are concerned, wait a few more days and then take a home pregnancy test. Remember that irregular periods can happen but it is always good to get checked out just in case.