Cervix is slightly dilated. Does this mean I have an incompetent cervix?

Not necessarily.. If this is your first baby/pregnancy, then it may mean so. If second or more, slightly dilated cervix is common/normal and it likely stays that way until close to delivery time. Nevertheless, regular follow-up with your OB is strongly advised to ensure that it is so. If it dilates/opens up more too early, then it is incompetent and treatment maybe needed. Congrats on your pregnancy. Good luck.