There is a very, very, very slim chance. More than likely you are not pregnant. But, whenever bodily fluids (specifically semen) are exchanged (in this case in the form of precum), you have the potential to become pregnant.

Does that mean you are pregnant? No way. Many factors come into play with pregnancy. Timing is the most important one.

If you do not wish to become pregnant, please always make your boyfriend wear a condom. Even if you are just rubbing your parts together. A condom will keep you both safe.