What happens if you miss a week of your birth control ?

I missed a week and 4 days of my birth control my period tracker on my iPhone says I ovulate on the 9th and I'm fertile the 4th - 11th I think . me n my bf had unprotected sex on the fourth fifth and sixth . I kno I was wrong for missin em but it's hard to fully remember to take em . what's the chances of getting pregnant ? oh and I'm 18 years old