Nordette is not an emergency pill and as such, contraception
, in the manner you have taken the pill, cannot be assured, more so because you had intercourse during the fertile period. Now that you missed your period, the reasons could be either a hormonal
disturbance due to the pills or pregnancy
.You should take a HPT now and if the result is inconclusive, go for a blood test
and a trans-vaginal sonogram. See your doctor for further management. Take care.