What's the norm?

Christina • If I cannot dance, no I shall not be apart of your revolution. Professional hairbrush singer & mirror dancer.
Just out of curiosity, what is the,  "norm" when it comes to conceiving correctly and becoming pregers? I've had three really terrible life changing  misscsriages' & it feels challenging to even try again, at times sven discouraging. 
-I heard that if you lay on your back and put your legs up the wall it helps because of well.... gravity myth?
-which position is preferred to work? 
-is there any other tips or any information that are not just myths; any of you lovely ladies could possibly mentor me with?
-I (of course) am open to any and all tips (:
Thank you all so much for all the support, love much, stay safe and happy pregnancies(:
Xoxo Chrissy