Havent had period in 6 years, had one on may 30, lasted 4 days, now i am moody and very horny. could i be pregnant? can i get pregnant? what can i do?

How old are you?: Why haven't you had a period in six years? Any medical condition? Anxorexic? Do you take heavy meds? Did anything change to allow menses to begin? Pregnancy is a risk anytime you have unprotected sex (and even if you have protection, sometimes), so with these conditions, I'd visit my OB-GYN soon. Do some blood work?

Anxiety: I understand your concern. It seems that you did not have symptoms of pregnancy since May 30, 2015 which was 7 months back. Being moody can be a symptom of stresses affecting your life-relationships, unresolved feelings and conflicts in the relationships, school, work, use of Alcohol and drugs causing Anxiety and Depression. See Gynecologist about pregnancy. See Psychiatrist for Therapy for stress

Maybe: Only way to know for sure is to check a pregnancy test. If possible go out to a local retailer like Walmart or a pharmacy and pick one up. IF negative, its probably time to see a gynecologist as prolonged periods of amenorrhea (no period) may be due to or cause medical issues if persistent.