Help!!!!

Olga
Hello everyone! 
A little history about me, I was on the nexplanon for a little over a year, got it removed June 29, got a period July 25...and for the past week I have been feeling crazy nauseous and get these little annoying headaches. Idk what the heck is wrong with me! Like, could I be preggers? Idk when I ovulate now, idek when I ovulated last month lol I took a test today, but BFN! Any input would be appreciated! Baby dust to all!!