Check my previous post but until the second trimester the uterus is in the pelvis and protected by the pubic bone. Women manage to do many amazing things before they know they are pregnant with no adverse outcomes.

Danni - when we take so long to get the baby we desire and are on the verge of IVF etc we are bound to be more cautious. Whatever you choose to do will be the right thing for YOU and that is the only person who matters. If people say you can do X but you don't want to just say yes I know I can but I choose not to. Not everyone will understand your position but that is their problem.