Can u bleed like a period and still be pregnant

How is it even possible yesterday I started bleeding and now today it just got a little heavier I'm disappointed because I've been trying for almost a year I thought it was just bleeding after sex but no my friend told me to still test cause she still had hers before she found she was pregnant but I don't think I am because I know some women have told me they have but doesn't it mean that ur egg wasn't even fertilized I do wanna test but I just think it's gonna be negative 😔