With my DS I had symptoms from 3 weeks, before I even tested. I felt so sick all the time, extremely tired, very dizzy and everything smelt and tasted really different and funny. I certainly knew I was pregnant all the time. Now I'm 6 weeks and have no symptoms at all, even my boobs aren't sore anymore. But I have read that pregnancies can vary even for the same woman so I'm hoping it's nothing to worry about.