Pcos, Birth control, no period?

So I was diagnosed with pcos the beginning of January. I was given birth control to regulate my period and try to get my body to do what it's supposed to do. I've gotten careless with it cause I've got the mentality if it happens it happens. I'm on the last row of my pills when I should get my period. I've taken 5 of them and still no period. The only symptom I have are swollen tender breasts. Could I be pregnant? I have had unprotected within the last few months.