I'm gonna guess...... a baby! ;)
Ha. No but seriously, being on my 6th pregnancy (3 boys & baby makes 3 girls) I can't even try to guess based on symptoms because it truely varies by pregnancy, not so much gender.
Oddly enough the only symptom I can say that has truely been "gender specific" for me is morning sickness. With my girls, I have horrible MS. With my boys, I didn't have the slighest bit of it. But that's about it. And many many of my friends had MS with their boys, so it's definitely not a true "gender specific" symptom for everyone.