How to know if I'm having a boy or girl?

Are there any signs, as of physical or anything to inform you and give you an idea to whether your having a boy or a girl? I'm 14 wks pregnant and my ob won't schedule me for an ultrasound until I'm 21 weeks! I'm anxious to find out :) I've been experiencing facial breakouts, I've been expressing armpit odor ever since I got pregnant I take a shower almost 3 times in a day and put deodorant on every 6 hours because it just comes back :/ I'm not gaining weight, I've weight the same for about a month and lost weight, my hips are not bigger than before, only breast are bigger. Baby doesn't move frequently but when the baby moves it moves a lot :) has anyone experience this and have a clue on what I'm having?