If your pregnant...

If you’re only a few weeks along, it’s unlikely that the fetus is in any danger.

My mom fell on her stomach when she was pregnant with me, and I turned out fine :) Tho some would argue against that haha.

You would be fine because there is so much padding around the fetus because it is so small, it is surrounded by organs and fat. The most danger to a baby is after it is bigger and there is a smaller cushion around the baby, a fall could cause serious damage at that point. Of course any rough housing or overly violent activities could cause a miscarriage, pregnancy is delicate. I had a friend in collage who miss carried because some guys were messing around with her and tickling her and grabbing at her a lot. (she was only 2 or 3 months along)