SOS PLEASE!! Thinking i’m pregnant when i’m not

So i need help. I have no idea how to get over this insane thought that i’m pregnant. Now I’m going to explain how insane this is. Last time i had sex was in November, unprotected and used the pullout method. Not the best idea and truly the worst sex i’ve ever had. A week after i got paranoid and thought i was pregnant and i took a test, results were negative. Got my period a few days after the test. Everything should be good right? Well, I was still paranoid after my period ended and did the same thing all over again. Another negative test, period again. But i couldn’t shake this thought or feeling. even though i had no symptoms. But i was so paranoid and stressed that it messed with my eating. So I sobbed to my mom, she took me to get another test and it was negative. So I made an appointment with my gynecologist to get the birth control implant in my arm. a few weeks later I got my period again and that was when they inserted the implant. Obviously testing me again for pregnancy before putting the implant in. Since november i have taken 5 tests, all negative. I have gotten my period each month. I have no symptoms and by now i would be showing which i’m not. I don’t know how to shake this feeling and I feel so alone and crazy. I just need help, has anyone else been though this or something similar? How have you gotten through it?