Please give me advice. :)?

Ive been terrified of pregnancy my whole life ive been to counseling and many psychologists....i met a guy and we had sex he has had a vasectomy for 4 years and im on depo provera that lasts 3 months we had sex on week 11 of my shot im diagnosed with obsessive comoulsive disorder and cant stop stressing thinking I might get pregnant any words of advice or comfort :)