My cycle been on for one week and 3 days and my boobs hurt do that mean I might be pregnant

What do you mean your "cycle been on"? Please write in complete sentences with punctuation to avoid confusion.

Sore boobs can mean a number of things, not just possible pregnancy. And if you've had sex, then yes, there is some chance of pregnancy.

The only way you'll be able to determine if you are pregnant will be through a pregnancy test.

What do you mean by "do that mean I might be pregnant?"

Do you mean "DOES that mean I might be pregnant?"

If you are having your period, probably not. It's usually a missed period that lets you know you might be pregnant.

Let me try to read scared young teen ( my guess there)

Her period is week late and her breasts hurt.

That is a sign of pregnancy, so have you had sex ( a real important requirement)

And have you taken a pregnancy test yet??

my cycle been on for one week and 3 days

I take that to mean that she has been on her period for one week and 3 days.