Nervous to take a test.

I've never been soo nervous to take a test before until now. I'm 4 weeks late today. Almost every time I eat I get sick to my stomach and just cant eat anymore. I even get the same filling from having one drink. I keep putting a test off because me an my fiance have been fighting so much the last 2weeks to the point we have almost broke up. I know I probably would take a test but I'm just so scared. Because if I'm not pregnant then I'm worried something else could be wrong.