Yes it can. Four days is not very much.
You might be pregnant - take a test
No, it is not pregnancy, it has happened to me, its nothing.
Give it a couple of more days, then take a test. You were really asking for it.
Usually four days late is enough time to get a positive test. If the test is negative and your period doesn't start, retest in one week.
It means your period is five days late. Only you know your chances of being pregnant.
the hell if i know
Yes, sometimes your period can just be late. You can check this site for more information as to why it could have been late. http://www.scarleteen.com/article/pink/m_i_a_or_dude_wheres_my_period
Initial stage Intermediate stage Late period Delayed period
What if you are three days late for your period? It's normal for there to be around 7 days variation from your average menstrual cycle. A few days 'late' isn't a big deal, as long as you're not sexually active no reason for you to worry about it.
There are a few reasons why a person may have a period that is 9 days late. The person may be pregnant or it could be stress related.
If you are sexually active then you could be pregnant but if not then you could just having a late or irregular period.