Mucus comes out when in same position after intercourse..any remedy for this?

I'm trying to conceive. After having intercourse, my friends suggested me to be in the same position in order for the sperm to get into the fallopian tubes. My doubt is that whether to be in a position(doggy position) as same as while having the intercourse or can lie down in the horizontal position. I didn't change the position for 15 minutes and after that I stretched my legs and kept them in a horizontal position which is very similar to the one while we sleep. But I noticed that part of the mucus/semen came out from my vagina. Can anyone tell me in which position should we keep in order to attain pregnancy?