Constantly irrationally fearful of being pregnant

Sarah • dook
Hi, I'd love some help please! Maybe someone else is feeling the same way. I'm always worried that I'm pregnant to the point where I've stopped enjoying sex altogether. I feel bad about that but I mean it's been four months since I last had sex and I've had four normal, on-time periods but I am still convinced... I even took a test today because I couldn't take the anxiety. Of course it was negative. This paranoia / anxiety is driving me crazy I can't concentrate on my studies and I've been losing weight (not a thing I need to lose) help :(