I'm supposedly 16 weeks (yesterday) I don't feel any different. I was lucky in that I got no physical sickness, just nausea in the first trimester. And I was very tired.
Now fast forward to 16 weeks and I don't really have a bump, I have a bit of a tummy anyway as I'm overweight. I can't feel my uterus (supposed to be half way between pelvic bone and belly button now) haven't felt movement, no physical signs of pregnancy AT ALL! I'm getting really paranoid about my 20 week scan in a month's time.