I'm thinking of piercing my left nostril because according to Ayurvedic medicine, this can help boost fertility. Anyone heard of this before?

Err, it's my first time hearing this as well. From a scientific point of view, nose piercings do not affect fertility in any way. It's about as effective as touching magic fertility rocks or trees. You could try piercing your left nostril, or these other methods: http://sg.theasianparent.com/help-to-conceive-your-child/