I had unprotected sex and I took d morning afer pill the next day.It was my first time using it.My period came like 4 day after does that mean I am pregnant.

Probably not, but even emergency birth control is not 100% effective. It is not uncommon to have some bleeding in the days after taking the birth control. You may find that your first actual period may be off a bit as well.

You'll need to wait until your next period is due and see what happens.