Panicking and dont know how to calm down

I have an anxiety disorder, I already take medication for it. My therapist quit and I havent gotten a new one. I have such a fear over getting pregnant so I got myself on birth control the IUD, its the first time im on birth control ever. Well I have a guy I have been talking to, he has been asking me to date him but I dont fully trust him. Well yesterday he spend the night at his bm’s house, today he told me that he didn’t sleep with her that he has been telling me that so many times. She doesn’t let him take the kids to his house I have witnessed that. Well today we were talking normal, outta no where he stopped replying, I called him and the call went through, I called him again and it sent me straight to voicemail. I txted him and the msgs went through so that means he has his phone on do not disturb. Im now panicking that what if im pregnant and he leaves me. I live in Tx so its scary as it is since I dont have options. I used the pull out method while on the IUD but on my fertile week and thats why im in my head so much, my anxiety is going through the roof. Im so scared… yes call me dumb I know im dumb. I have a week to go to start my period😓😓