Anxious!?

I’m 21 days late! I haven’t tested! I get so anxious. I don’t have any symptoms. So I convince myself I’m not pregnant and that’ll I’ll be getting my period soon. I had a miscarriage and had a period after that but only had sex once and it wasn’t even on my fertile days so maybe me missing my period Is because of the miscarriage? I’m just scared to be pregnant again. I know this may sound dumb but it was my third miscarriage and well I couldn’t handle another one