Getting Pregnant???

Well when I was 15 and a freshman in high school I lost my virginity and ever since then I have used unprotected sex. (Yes stupid) and one time he ejaculated inside of me and I was scared but months later nothing happened as time went on he kept doing it and still nothing happened , 2 years of dating and doing this nothing ever was happening, I was really curious on why. A year later I'm with a new guy, With my boyfriend and me now he ejaculates too. Now he was scared but I just know nothing will happen. I'm scared that I may never be able to have kids or may be very bad to be able too. Does anyone else have the same problem with wondering why they aren't getting pregnant??