Conundrum

So someone explain this to me. I have actually lost 3 lbs since finding out I was pregnant. However, my pants are tight in the waist and driving me nuts. And if I eat something, forget about it, I look like I have a 6 month old food baby in there! It's quite uncomfortable. Now I realize my belly is supposed to get bigger, but everything I've read clearly states it's practically impossible to be showing before 10 weeks at the earliest. So this is my conundrum. I'm down to one pair of fat jeans that I can stand to put on.