Information please

I though I had a period last week but it was really just very spotty, the shortest and light period I've ever had. But I've noticed the past month that I'm gaining weight around my stomach a lot more than I ever have, I'm always hungry, my emotions have been random and I've been a lot more tired. I'm on birth control and I have a disease called Polycystic ovarian syndrome, which means that my likely hood of having children is very low. My husband and I would like kids one day but I'm almost done with school and months away from getting my dream job. Do you think I'm pregnant? What advice can I have??