More worried about not knowing I'm pregnant than actually being pregnant

I don't want to think I'm pregnant but lately I've had random heartburn, back ache and it seems as though I've pudged out and have been gaining weight. This has been going on for a while but I haven't taken a home test because I have been waiting to miss my period but it never happens.. And I know you can bleed while preg but my periods have been perfectly normal.. I'm more worried about not knowing I'm preg than actually being preg (that show I didn't know I was pregnant scares the shit of me)