hun they all say the exact same thing...and none of them say that its impossible to get pregnant while on top
the whole way you get preg is when the sperm swims up to the egg and fertalizes it. it can swim up there either way your doing it
doggy stile
on top
updide down doing jumping jacks
you can get pregnant anyway you have sex and yes sperm can live in you for 5 days so pretty much however you do it you can get preg
out of all the sperm only one (sometimes two which would make twins, three would be triplest etc) will fertalize your egg and it doenst mateer what position your in