Missed Birth Control Pill: Could I be pregnant?

Hi everyone,
I am 19 years old and am now on my 3rd month of Aviane birth control.
I always take my pills religiously, except for in my last package on the 3rd week.
On the 3rd week I took one of my pills at around 11:00 am instead of 9:30 pm the night before.
I took my pill as soon as I woke up, and took my next one at the regular time of 9:30. After taking 4 regular pills since the missed one, I had sex. (that following Saturday)
I always use a condom as well as birth control, but for the first time ever the condom broke. Luckily, I noticed before my boyfriend ejaculated, however, I still worry about pre-***.
I got my period during my sugar pills on Wednesday as usual. The period however was light and only lasted a couple days. That was only my 2nd period since I started taking birth control and the doctor informed me my first 3 cycles may be irregular. I was just wondering what everyone's opinion is on my risk of pregnancy? I know it is low, but some opinions would be helpful! I am now on the 2nd week of my 3rd pack and am feeling extremely nauseas.. I am getting a little freaked out! Let me know your thoughts.