im in kind of the same situation that we are trying to concieve too. i recently just posted about this too for some advice. you can check mine because a couple people posted about mine. they said to try doggystyle. which i did and a lot less does come out. Good luck
there is a site called mymonthlycycles that allows you to track your cycle so you can keep track of the best times to coneive etc.
other than that and legs up i dont know !
good luck
i have friends that have tried for a baby and they reckon that the best way to do it is to have a pillow under your bottom ,they all fall pregnant but everyone is different. just remember if you have sex and got out of bed soon after gravity will take hold. i suggest trying everything once and just see what you feel comfortable with love. get luck and best wishes.