It usually depends on how off track it is, and what's going on in your life. Things like stress can alter the pattern of your period, so more than likely it's nothing to be worried about. It's possible to completely miss a cycle due to stress. A visit to the doctor to make sure can never hurt, though.
You should take a pregnancy test to be safe.
If your period is always on time you can worry within a few days after missing...But normally a week late is enough to take a pregnancy test to see I would add that if you are worried about pregnancy and weren't doing so, you should be using proper contraception or not having sex.
If you get bit by a fly you should be fine. If the red spot gets bigger you should see a doctor.
if you are young it is naural you and your body is just starting. you shouldn't be worried but if i was you i would keep and eye on it, adventually it will go back to normal
That's very normal you should be fine..if your worried I would see a doctor..
Stress
You are obviously worried about this, but please understand every person is different and while some people start their periods young others start them later, and this is quite normal, it is not a race! However if you are very worried you should ask the person who cares for you (e.g. your mom or dad or guardian) to arrange for you to go and see the doctor for a check up. Tell the doctor about your concerns so that is there is a problem, it can be investigated.
There is no need to be worried at the present time because 13 year olds who are a virgin can miss menstrual periods from playing sports; stress; or even having the flu. However, if it lasts for three weeks you should have your mother take you to the doctor just to be sure there is nothing wrong.
Its normal to occasionally miss a period. About 2-3 a year are missed on average.
Yes, it is normal. It can appear at anytime, as early at age 10, or later at 16. It can even appear earlier or later. If in doubt, contact your doctor.
Normal
Yes.It is normal but it is not your true first period. It will come later.