Anxiety getting the best of me

So I'm sexually active and about 3 weeks ago I had sex without a condom. I am on birth control and take it pretty regularly, give it take an hour or two. He also pulled out. Being me with crazy anxiety that always gets the best of me, I have convinced myself I'm pregnant. I know there is a minuscule chance but I just cannot get it out of my head. everything I feel, I relate to being pregnant and having symptoms. It's getting to the point where i'm thinking of stopping intercourse:/AF is due Wednesday so I am saying my prayers. Does anyone have any methods with coping with anxiety? It's taking a toll on me and my body.