In my research into this same topic, I keep coming up with a Shamrock (four leaf clover) design on a flat smooth piece of moonstone. Moonstone is said to enhance fertility and to promote ease in pregnancy. I don't know where to get a ready made charm like this, so I got some moonstone and carved a shamrock into it gently. (rather difficult!)

Mythology also calls for a female statue to be stood in the bedroom somewhere visible - it needs to be a statue that "calls" to you, or that you find visually appealing, or that you like, or has special meaning etc. I'm not sure if this is Feng Shui - I don't really know much about Feng Shui.

With the incense, Musk can help set the mood for BDing - I dont' think it specifically enhances fertility as such, but it certainly makes the room smell nice and can make it all romantic, and according to some mythology I have read, (Im' not sure of the truth of this, but I like it anyway) there are many baby "spirits" floating around the air, waiting to choose their parents, and they want parents who love each other, so romantic BDing could work. (Plus it's fun!)



One thing I have been doing is something my grandmother taught me - wishing on the first evening star on the first day of a new moon. When I was about 5 she told me that that's the star that grants wishes, so all my life I've done it, and things seem to come true from it. (I got my DH!) I don't know if it will work for a baby, but no harm in trying!