I am a very fit person. You can see from my profile that I am a fitness professional, and I have a video for prenatal exercise. I exercise every day and have never had a heart problem. But for the last couple of days, I have been short of breath, dizzy, and lightheaded. I couldn't stand for most of the day Sunday or Monday. When I did, I felt suddenly winded. Is this normal? If not, what could the problem be? With 5 weeks left in my pregnancy, is this going to continue to be normal?