7 weeks pregnant, very tired, light headed, dizzy is this normal?

Ugh the seventh weeks was terrible for me. I was dizzy and light headed all the time. I live on the third story (no elevator of course) and by the time I got up those stairs I would be so out of breath it was ridiculous. I am 10 weeks now and I am back to normal. There is a lot in the baby making department around week 7 and 8 so its extra strain on your body