My cycle has never been regular, it just started but its very light and spoty could I be pregnant?

Yes. Spotting lightly is not a sign of pregnancy, however, spotting during pregnancy is not uncommon. If you think you may be pregnant plan to do an over the counter pregnancy test a few days after the missed period, .
Possibly. The fact that your cycle has never been regular my also indicate that you don't ovulate regulaly. If that is the case , the linning of your uterus my just be a bit unstable , and thus the spotting.