The possibility of levonelle
delaying your period is less. This is because period delays are usually caused when levonelle pills are taken near the period time. But you took in near your mid cycle.
Also such long delays have to be evaluated for pregnancy
first and then assumed to be a side effect of pill.
Any unprotected intercourse
can result in pregnancy. Also when levonelle is used more than once in a cycle the efficacy of the pill in avoiding pregnancy decreases.
You should do a urine test for pregnancy.
I hope I have answered your query.