It is possible. Pre-ejaculatory fluid contains no sperm as it leaves the Cowper's Gland. (It is the fluid that oozes out of the penis when a guy gets an erection.) But if the man's urethra has sperm in it, which it might if he had ejaculated recently before having sex with you, the sperm hanging around the inside of his urethra can hitch a ride on his pre-ejaculatory fluid into the woman's body. Ejaculation (of semen) would not be necessary for some sperm to get into her body riding along on the pre-ejaculate. Lots of women have reported they got pregnant that way.