I need some advice on my nexplanon birth control and possible pregnancy. I have had the nexplanon for just about a year…

I need some advice on my nexplanon birth control and possible pregnancy. I have had the nexplanon for just about a year now, and have had no symptoms except irregular bleeding. On November 26th, i had sex for the first time while being on this birth control (so sex for the first time in over a year). Since then, i have been feeling nauseous off and on every day, dizzy, extremely tired, have had lots of headaches, bloated, loss of appetite (nothing sounds good anymore), somewhat sore/tingly boobs... etc. Is it possible that im pregnant? I wouldnt think the birth control would be giving me symptoms a YEAR after having it implanted. I have taken a few dollar store tests, but i know it would be too soon to test. Please help!