My anxiety is killing me, please help

I've never had sex, haven't missed any of my recent periods or even had morning sickness! But my mind keeps telling me that I'm pregnant! I've been stressed and I'm eating a little more than I usually would and my stomach is getting fat so my brain is thinking "yup you're preg" but I've never had sex. This is really stressing me out........has anyone else experienced this type of anxiety??