Yes, it is. Although pre-ejaculatory fluid is just fluid, after ejaculation, your urethra still has a lot of sperm in it, like little bus passengers that didn't make it onto a full bus. The next lot of pre-ejaculatory fluid that comes with the next erection can bring the sperm right along with it into the vagina, even if you don't ejaculate again.
Thanks for clearing that up for me.