Is Pregnancy Possible If Norlevo Taken After Unprotected Sex?

My boyfriend and i recently had unprotected sex and did the pull our method. Before he cummed he put on a condom aand continued. I took Norlevo-1 about half an hour after this. My periods are still very irregular, and after i took the morning after pill (Norlevo-1) i had bits of blood in my discharge, and it has decreased. I've had period pains, but no period has come. My last period was on the 11th of December, and I had unprotected sex on the 3rd of december, and took the Norlevo-1 on the 3rd of december also. Could i be pregnante ?