Don't panic, because I didn't actually get tired until about 7 weeksish if I remember right. Also the sickness didn't set in until about 8 weeks, and my sore bbs didn't really appear until about 7 weeks. In fact until the sickness set in I didn't really feel pregnant at all! My sore bbs came and went all the time, and I know loads of people who were the same, so try not to worry. I know it's easier said than done though!!