Pregnant...or not? What do you think?

Im gonna try and make this short. Me and my boyfriend had sex 3 weeks ago without a condom and he came inside of me and i had accidently missed a day of birth control and i still hadnt taken it the day me and him had sex. so pretty much 2 days. 3 weeks later (now) Ive been having sleeping troubles...Im not constantly tired..im like NEVER tired. and i keep getting headaches and migranes every single day. i feel naseaous (no throwing up) alot. and i also have been peeing slightly more than usual. also, my birth control makes me have my period for a week (its never been shorter/longer than a week. birth control makes it REALLY regulated.) on the tuesday at the end of every month and on that tuesday i was supposed to get it I DID get it but it wasnt the same bleeding i usually get. it was heavy at first and then really light and seemed to have discharge in it. then after only 3 days of having it..it stopped. im STILL supposed to be on it but Im not and havnt been on it since thursday. and i feel like im hungry all the time..but when i go to get food i start to feel sick. and things that i used to love (like burgers and eggrolls) taste wierd to me. but then again..with the food tasting wierd it might have been just because i ate somewhere different those times. one more thing..ive noticed ive had..er..well..bowel movements more than usual. WAY more than usual. after everything i eat it feels like i have to go?! so what do you think? thanks for your input!