In all reality and honesty, neither do anything. When a male ejaculates into a female it's already put exactly where it needs to be. When I fell pregnant we would finish and I would immediately get up, clean myself off and shower. You can either or, or both if they make you feel better about it, but there's little to no need for it.
I used instead soft cups after sex so that I could get up and move around...I'm 6wks and 2 days...
I just laid there in bed watching tv or went to bed afterwards lol..... We tried the pillow thing, holding my legs up, etc but I didn't fall pregnant unfortunately.... However, in December after BDing, I simply fell asleep afterwards and am now 10 1/2 weeks lol
I just put a pillow that was already within reach under my hips very gently so as to not strain at all. I then crossed my legs almost criss cross style in the air but just because it was comfortable...then I would fall asleep for the night lol! It worked many times! This is my 6th pregnancy! Good luck!
I did both I used a pillow under my hip and put my legs on the wall.