3 days late

I'm 3 days late. I want to test, but I'm terrified. Afterall, miracle don't just happen do they? In a month where there was an HSG and relations with the husband only once, is there really a chance? Anyone else ever be late after an HSG? Hope is creeping up with each day of being late, yet I know that my chances are really, really small that we managed to get pregnant all on our own. This wait may be the one, but I can't bring myself to find out for sure.