Hello, I would be happy to help you with your question.
When there is such irregularity in terms of when you took the birth control pills AND with the added use of postinor tablets, it is no suprise that your cycle is late. The pregnancy
test indicates that you are not pregnant, but this should be repeated in 1 and 2 weeks to be sure. During this time period, you also need to use condoms.
I hope that this helps and good luck!