Necon 1/35

I am 25 and have just started my 2nd month of this birth control pill. I have not been on birth controls pills since I was 19. I am having light bleeding often (a few times a week) that is very dark in color. I am also finding that I am somewhat irritable and uptight, which is not in my normal way of behavior. Could these be side effects of the birth control?

Thank you for your response.