the side effects of Alesse-28

Well, I started Alesse-28 about 8 months ago. I did have spotting inbetween my periods. The last 4-5 months i would have lesser and lesser periods. Not as heavy, but then in the first place I didn't have too heavy of periods. Now last month I didn't have my period but I read that you can miss a period but just not to miss two in a row. I would also have some bad cramping in my abdomine, sortness of breath, some headaches, and then pains in my chest. Is there a chance that I could be pregnant or should I wait until my next period SHOULD come?

Scaried