Hi Reikini,
I gave myself Reiki and also gave and received Reiki and spiritual healing throughout each trimester of my pregnancy with my third child. It was a lovely bonding experience to be able to give my unborn child Reiki :)
Out of all my children he is the most placid and laid back....not sure whether that is down to the Reiki or the fact that he is the third born :))
I also agree that you will know if it doesn't feel right...listen to your intuition and tune into the baby :)
Gentle Blessings
Helen