Am I pregnant?

So around valentines day that weekend, I accidentally missed like 3 birth control pills and he came in me more than once. after that, i went back on it. around maybe 2 weeks ago, i started spotting very little and it went on for like 5 days. Now today, I woke up feeling so nauseous, my boobs are bigger/more sore than normal, I feel sick to my stomach, horrible headache, slight cramping, and i've been very emotional lately (crying at pretty much everything). and i just feel off. Could I be pregnant? help!