just lost virginity... scared of pregnancy... it's causing d

I am 22 and just recently lost my virginity to my boyfriend of 9 months about two days ago. We used a condom... but we used ones that I had picked up at a parade... and they had been sitting in the sun. I had not a clue that temperature and heat effected condoms durability, but that makes sense. And that is also a scary thought. I am not on any form of birth control because since cancer runs in my family, my parents didnt like the idea of hormones and the pill and the connection between added hormones and cancer. Anyways, I really thought I would abstain from sex until I was ready to have a kid if i somehow became pregnant... but i didn't. And, now I am paranoid at the possibility of becoming pregnant. I am becoming soooo depressed at the idea. I absolutely know that if I got pregnant at this point in time i would have an abortion... and he would not approve.... and I know that I would probably do it behind his back and that could destroy our relationship. The reason that I don't want to have kids right now is because I am a career driven girl without the finances yet for raising a child. I feel I would be a bad mother at this point in my life and adoption would complicate my life and the lives of others. Also, I am still in college and have lots of debt to pay off. Still, I felt like losing my virginity to him was a good decision... but I am so stressed out worrying about whether I am safe... or whether I am pregnant, that I am wondering if this is all worth this added stress. It bothers me alot. I am wondering if i should just not have sex again with him.... and see if this bothers him....