I Recently Discovered That I Had Been Taking Mercilon Incorrectly.

I recently discovered that i had been taking Mercilon incorrectly. As I was used to a 28-day pill, i did not know you were supposed to take a week off. Thus, i moved straight into my new pack. I felt cramping last week, but had no period. Also, i did have sexual relations, but with condoms. Recently, i took a pregnancy test, which came out negative, but I'm in a country where they do not have early response. is there a chance that i am pregnant, or is my lack of peeps a result of incorrectly taking the birth control pills?