Ketu and the full Moon

[PinkAm 0]

I use to wear a Turquoise for Ketu, because it is very very benefic for

me, for my health end for everything in my life.

It is a lucky stone for me.

I’m born in Ashwini, and Ketu is this Naskshatra’s Lord, moreover

my Ketu is in the second house with good planets.

But I noticed that when there is in the sky the full moon, for few

days, always, Ketu gems are not ok for me anymore, because they give

to me a lot of nervousness.

Is this normal?

My Lagna is Taurus and my Moon is in the 12th house, being

Ashwini Nakshatra.

Thank a lot for your kind replies.