haven't ever missed a period before, and I don't have any symptoms of pregnancy

Hello,

I have been with the same guy for almost two years now, and have been on birth control the entire time. Everytime we've had sex, we've used a condom as well. 

I'm a Sunday starter, and at the beginning of this month, in my first week, I missed a pill on Tuesday night but took it immediately Wednesday morning. The packet that comes with my pills says that if I miss one in the first week then I'm still protected, and that no other protection (condoms) is needed. We still used one though, as we have everytime. My pills ended this  Saturday night(17th), which means I should start either Sunday, Monday, or Tuesday. It isn't ever the same.  

Today is Tuesday, and I still havent started. My boobs always get really sore the week before I'm due for my period; they did this time, and are still sore, but I haven't started yet? 

My boyfriend and I have had sex about 8 times this months, and none of the condoms have broke or leaked to our knowledge, and I haven't missed another pill and I've taken them all around the same time.

I haven't ever missed a period before, and I don't have any symptoms of pregnancy like nausea, constipation, morning sickness, or anything.  The only thing I've notice is my boobs (which is normal before my period) and I'm a little gassy..

Am I or could I be pregnant?