I'm pregnant with #3 as well and wondered the same thing early on. I was still not showing at 14 weeks yet this time around and worried something was wrong because I remember showing sooner with my other two boys. I had the belly bloat, but it would be gone by morning and stomach would be flat again. I have since gotten a definite bump. Small, but it's there! And I can feel baby kicking daily now. When I had my first scan at 12 weeks I was actually measuring 4 days ahead as well, so size of bump means nothing. Rest assured, baby will move up out of your pelvis soon and your belly will start growing. I didn't see anything significant until just this last couple weeks myself, and still smaller than I was with my other two.