Pregnancy: What should I do?

I think I got pregnant, my menstruation is late for 3 days, I don't know what to do. My life is unstable, I don't have a job, and I'm not married. I did an abortion 4 years ago, and I regret it, so I really don't know what to do. I used contraceptives but yet I still am late, I don't know if it is because of stress, maybe because I had to take Aprazolam this month because of anxiety, or if I'm pregnant, I can't stop crying.