I'm worried if will get pregnant because we had our sex last night with my boyfriend,

Being a little rude, before you had sex is when you worry. You use at least condoms.
Now you have within 72 hours of the sex, to take a "morning after pill" (Plan B) The longer you wait, after sex, the less effective it is.

But it is not 100 percent effective. Now you wait till the next cycle and see if you miss it.