well i was having sex and my boyfriend felt the condom pop and he took it right out when he felt it. and i asked him if he skeeted and he said no. But, i am still scared.
I think if what you heard was it popping, you would be able to see obvious damage to the condom.
If you're still concerned, you can look into Plan B if it's been 72 hours or less since you had sex.
If he did not ejaculate, and still had the condom on (even if it popped somewhere) there would only be an infinitessimal chance of getting pregnant.
If you thought it might have broken, why didn't you inspect the condom? Regardless, it sounds to me like there was too much air in the tip and when he thrusted, the air bubble got pushed out the top by the pressure.
In order for you to get pregnant from an incident like this, there would have to be SO many things in play, ie if you were ovulating, IF there was any sperm in his precum, IF the lubricant/spermicide in the condom didn't kill the lone sperm in his precum...
I think it is probably ok not to worry about this incident and keep up the SMART move of no ejaculation inside, even with a condom - that is playing it safe!