I had I intercourse 4days before my initial period and 2 days before my initial period its been 5 days and still no period could there be any other explanation and my period is always on time

You could just be having an off month, you could have an infection, it could be stress, diet change, weight loss, weight gain, illness, medication, pregnancy, a tumor, you name it.

Really no way to tell you what's going on.

If you think you may be pregnant, wait until your period is at least 14 days late, then test using first morning urine. If that test is negative, wait for the next period, if you miss it, test again or get a blood test done.

It can be many things, are you normally sexually active ? Do you use any birth control, use protection of any type?

There are dozens of reasons, stress is a big issue often,

But there is nothing you can do, till you are at least 2 week late, then you can do a pregnancy test using first urine of morning