I’m wondering can Accutane effect periods?

I’ve been on accutane for 4 months now with the 3rd and 4th month increasing my dosage to about 80 mg per day. I haven't had my period for 3 months; but I do get spotting, bloating, and cramping. I don’t have sex because I’m ace, so I know I’m not pregnant. Is this a symptom of accutane?????? I’m 27 years old, just in case age comes into play.