thank you so much for your answers I am very grateful.

hey Meggy keep us informed,

I agree with Aaron about first try increasing your Ojas, that is most important.

I also would recommend doing the Gayatri mantra untill you get pregnant, (it is often too heating of a mantra for a pregnant women). But it should help purify the body to bring in another atma (soul). Pregancy has the physical level of the body being ready, the emotional level of the mind being ready and the relationship of the parents to the atma. I have seen when their are odd pains in the body when either trying to conceive or after a close relative has died that it often relates to the atma level issue. In women it generally happens in the abdomonal area while in men it will often be sacral pain (as this is where the atma wanting to be born attaches itself to the male).
Just a thought.........There is also another mantra related to this level of problem which will be beneficial (if this is the root cause):
Santana Gopala mantra: Is for difficulties related to having children, it is done along with worshipping Krsna as a baby (though can be any form of the divine as a child- Buddha when he was first born, Baby Jesus, etc) though the mantra stays the same:
Devakiisutam govindam vaasudevam jagatpate
Dehi me tanayaM KriSNa twaam-ahaM SharaNagataH.