Can getting off of birth control cause you to be late?

I'm needing some help. I have been on birth control for about 5 years. There has been some occasions that I stopped taking the pills because of emergencies, but I always started on time when I quit taking them. My problem is that I had my last period on January 21, and I haven't had one since, and I have quit taking the pills. My boyfriend and I of 2 years has had unprotected sex since my last period. There were a couple of weeks where my breasts were so sore that it hurt so bad to just walk, but they don't bother me now. I do not have any symptoms of pregnancy and I have taken 2 pregnancy tests. They both said negative. I am almost 2 weeks late now and I don't know what to think. Can anyone give me any advice? My boyfriend is aware of the situation and we will be ready either way. I just need some advice, thank you!