Why whats wrong with me

Me and my hubby have been married for almost 11 months on Jan 4 and we've been trying to conceive his first my 4th well I have a angel baby and nothing has happened yet like what is wrong we've tried preseed for 2 cycles I've been taking prenatal vitamins in case we do become pregnant I've tried every position imaginable like I don't understand but I don't wanna take his dreams away of having a child with his genes what should I do I'm afraid maybe his soldiers aren't marching