Pregancy question please help. ?

I have the copper IUD and I am almost a month late on my period but for the past couple months my periods have been really heavy like filling up a super plus tampon Im a half hour and a pad in a hour. But for the past week and half I have been getting a headache almost the same time everyday. And then my back has been killing me and I keep feeling like I'm gonna throw up whn.I wake up. Do u think I should get a pregnancy test? Honestly I'm just really scared