I am on Mirena IUD and have been for about a year and a half. During this time, my periods have been rather normal and come about the same time every month. Last month I only spotted for one night (not even 24 hours) and this month I haven't bled at all. I assumed I would start around the 13th cause that's about normal if it comes a little late. Today is the 15th and still no sign of mother nature. Could I be pregnant? I've used condoms, but my son is a condom baby.

It is possible. The IUD should prevent implantation in the uterus, but it could be ectopic. I would take a home pregnancy test at this point and book a appointment with your OB just in case.