Thanks for clearing that up for me.
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.