Worried about pregnancy, but on birth control pills

Hi. I have been on birth control for the past seven or eight months and am usually very consistent about taking my pills. My boyfriend and I have an active sex life, and he generally uses a condom or pulls out if there is any likelihood that I may be susceptible to pregnancy. Since my last period, which is supposed to come within the next few days, we have only had sex a few times and I had either taken my pill except one day when he used a condom instead and I took my pill as soon as I could get home and take it. A couple days after the last time we had sex, I was in a traumatic car accident and have been in both physical therapy (for my lower back, which was injured in the accident) and emotional therapy for trauma since then. Therefore, I am having trouble distinguishing if the tiredness I am feeling and slight mood swings are from the accident or a pregnancy sign. Can someone help me distinguish whether there is even a good chance that I am pregnant, or am I just overreacting because I'm emotional from the accident.