You might get lucky and start feeling the baby in just a few weeks. :) I believe I started feeling DD around 17 or 18 weeks, although since she was my first, I wasn't sure that's what it was. By 19 or 20 weeks, I was sure. With this one, I started feeling him move around 15 weeks and I knew what it was right away!
2nd tri for me has been blowing by. Maybe it's because I enjoy it so much more than the 1st and 3rd lol. It would be nice if things could just stay this nice and comfortable all the way through the end, but noooo. I'm not looking forward to the last month or two, especially if my preeclampsia returns.