Failed bcp

I have been on birth control for 4 years now. I have been very good about taking it every day around the same time. My boyfriend and i hadn't slept together for a while and we just recently did and he did not pull out nor did we use a back up method and we have been doing it the exact same for a couple years. But just recently we did it about 5 days before my period which was 2 weeks ago and 3 weeks since we slept together. my period only lasted 2 days and was very light... about a week ago i have been experiencing major mood swings and have been very emotional sometimes. I have been having bright neon pee especially in the morning time. and i drink LOTS of water and nothing but water during the day. my boobs have been very sensative, i've been getting slight head aches that last for a short amount of time through out the day. I've had bloating and cramping through out the day as well. It almost feels like right when i'm about to have my period. Somedays i will be hungry just for sweets and other days i'm not hungry at all and cant eat much. I have been extremely tired and easily worn out. I have taken 2 at home pregnancy tests when i first experienced these symptoms, is it possible that my birth control has maybe failed me??