Khadgamala Stotra

The mantras pertaining to Sri Vidya are of foremost importance, as it has the power to cut off Karma and removes all sorts of sins. Hence one of the most advanced levels of Sri Vidya meditation is reciting of Khadgamala Stotra, even though this is called a stotra, it is infact a Mala Mantra with tremendous power. By mere chanting of the names given in the link below you can absolve all types of sins and acquire any thing we want. This is particularly good for those people who wants lead a material life as well as spiritual one.
This removes black magic effects, planetary ill effects, fear of enemies and thieves and many advantages are listed in the Phala Struti of this mantra. So do not take this lightly.

http://www.scribd.com/doc/129709214/Khadgamala-Stotra-In-One-Page

Gayatri Mantra for Infertility and Miscarriage

This mantra has to be used by both male and female and should be practiced together on Sunday morning's.
Chant the below mantra a minimum of 100 times (1000 will be great) visualizing Gayatri as male or female child and offer food to the god and eat the same food. This process needs to be continued till the child birth takes place.

Mantra

Om Yam Yam Yam
Om Bhur Bhuva Swah
Om Tat Savitur Varenyam
Bhargo Devasya Deemahi
Diyo yonah Prachodayat

This avoids frequent miscarriages, infertility and helps in having the desired child