Skyla help!

Zoey • Full time student, dancer and horseback rider
Ok, so I have the skyla IUD and my boyfriend and I have sex without a condom regularly and have for months and I've never been pregnant, I don't get my period at all anymore, so does that mean it's working? Not sure if I've just gotten lucky and not had sex during ovulation since we have a long distance relationship, or if that means it's working.