I find this so ridiculous as you might guess. No, I wouldn't change my plans. I would evaluate the information though and if I felt it was based on other potential factors, I might act upon it. (IE; since I've been publically involved with debating and debunking paranormal garbage, if I felt someone was trying to make a prediction come true...I would be cautious).

As far as astrological signs go, the only way they'd impact my love life is that I'd never date someone who believed in it.