I was like you. With my daughter, I had all the classic signs. When I got pregnant the second time, my period was late, and that was the only sign. In fact, I took a pregnancy test that showed negative, so I figured my period was just off. A week later, I still hadn't started and still didn't feel pregnant, so I took another test that also came back negative. This time, I started to worry a bit because I'd never missed a period, and I thought something might be wrong since I obviously wasn't pregnant. I had my yearly scheduled right about this time anyway, and when I went, he told me I was pregnant even before he did a test for me. Sure enough, nine months later, out popped my son! So, I suppose it could very well be true that you're carrying a girl since this pregnancy is so different. =)