I'm Scared I Might Be Pregnant

Destinie
I'm on birth control the one that's in your arm for 3 years I get it token out in Feb 2016 and my boyfriend been nutting in me for a week now and my body starting to feel strange & im scared everything I drink or eat feels the need to come up and when I was smoking I had to through up but I didn't I can't lay on my stomach it give me heart burn ... Can you let me know what's going on ... !?