I had unprotected sex on my 4th day and I took ipill before 12 hrs.this month still I did not get my periods .my periods are late by one week.. what step should I take now??

Wait another week and take a HPT.

Are you sure??
Because I am tensed a lot.. what if the hpt test shows positive??
Can I take any birth control pills like plan be or next choice?

Birth control won't do anything if you are pregnant. It is too late to take Plan B or Next Choice. Those are designed to be taken within 72 hours after intercourse.

Then what step I should take ,to avoid pregancy?

You first have to find out if you are pregnant. If you are, you will have some choices to make, like abortion or adoption.

Can a girl get pregnant when she had unprotected sex during her periods?

Anytime there is penile insertion there is the risk of pregnancy. The risk can be minimized, but not eliminated.

Since you posted this under Child an Teen Health, I assume you are not an adult. No one should be engaging in sexual intercourse unless they are prepared to have a child.

Yes - the odds are just smaller. But even if she is in the small odds group, and she gets pregnant, she is 100% pregnant.
Ovulation doesn't always happen mid-cycle, cycles can be long or short (no matter how regular they WERE), and sperm can live 3 days. All that is nature's conspiracy to ensure the renewal of the species.

But ovulation won't occur ? Then there are no possibilites

I meant that ovulation doesn't always happen mid-cycle (although that's the norm); it can happen at any time in the cycle.

What if she had taken an ipill after 10 hrs of unprotected sex ? Then are they any chances of pregnancy?

We can't keep playing 20 questions!
A woman can always get pregnant on a probability scale from way below 1% to 100%. A woman will always have to wait until she can take a test. Stop having unprotected sex, and let all this worry be a lesson.

https://www.askmehelpdesk.com/child-...od-752993.html

I've merged your two threads. Please don't start multiple threads over the same issue.

I understand that you are stressed about this, but the time to ask these questions were BEFORE you agreed to have sex. Once he entered you, the possibility of pregnancy became a reality. We can't tell you whether you are pregnant or not. Only that it is possible you are. You need to wait about 2 weeks after your period was due and take a test according to instructions.

If you are pregnant, then you need to make some decisions about what you are going to do about it. But you need to make them quickly, because the fetus will need care. If you are not pregnant, I hope you take this scare as a lesson and stop engaging in risky behavior.