If you had intercourse even if he did not ejaculate, there can still be tiny amounts of sperm in the pre-***. Most likely you won't get pregnant, but there's always a small chance. Be careful, and keep using condoms!!
I once got preggers while still on my period (one of the last days of it), and the guy did not climax. We did it for all of 10 seconds before I decided it was all a big mistake and made him quit. Obviously, he had some precum. It was a very isolated incident, so Im positive that this is when I conceived. Go figure.