Hiee I actually had sex with my boyfriend on 20 and 21 st of this month and I popped ipill in d evening actually my periods were supposed to come on 19th but I hve not got my periods yet.. Jst wanted to know if there is any chance of pregnancy

When did you take the "I pill"? The longer you wait, after sex to have it, the less effective it is. It is also not 100 percent effective if taken right away.

Where you using any other protection, such as condoms ?

So yes there is a chance of pregnancy. Also the I pill, if you read the instructions has many side effects. One of them, is that it can alter or make you miss your next cycle.