Really worried...

Hello, i've been on microgestin fe 1/20 since October 2013. I always take it at the same time every night and if i'm late the most i've been late is 2 hours. last month I completely missed my period so I took 2 at home pregnancy tests during the week that I was supposed to be on my period and they both came back negative. I continued to take my pills and today I should be starting my period again and i'm pretty concerned. do you think i'm pregnant? I haven't had any symptoms really and don't feel any different except i have a lot of white discharge.