No, but me and my friends have a theory about the full moon. If you were to make love outside or with the curtains open all night, on a full moon then you wouldn't be the first person I've met who had conceived that way
I'll definately humour you! Though I wouldnt recomend you go spending money buying spells.. just do a little research. (have also heard the full moon one) I also think that often its mind over matter and just the actual positivity and hope that comes from things like spells can be enough.
maybe you could try looking up various things connected with fertilty... various rocks, crystals, plants, animals etc and making up a little 'fertility bag or box' to keep under/by your bed?
In the past, I heard that people borrowed babies and that was supposed to help them conceive. I had a friend who used to chant something or other and wave a carrot over the tank when she was spawning scallops. I doubt that the scallops noticed much, but... Sorry, straying off-topic.