I'm halfway done with my Ortho Tri-Cyclen Lo plus I'm on Met and still I don't have a period. Is this normal? I know I'm not pregnant so what is going on with my body? I'm taking both MET and BCP and I'm freaking out because since I'm halfway done with BCP I usually would start spotting which indicated that my period was on the way. But nothing! I need help

If anyone knows the answer let me know please thanks.