With this pregnancy my symptoms started at 3 weeks but I could only tell this in retrospect. I got a stuffy nose and bleeding gums which aren't supposed to hit until way later. I did not get any of the usual pregnancy symptoms until AF was due - slightly sore BBs was about it really and that disappeared entirely by 7 weeks. I've never had morning sickness either so it is entirely possible to have very few pregnancy symptoms yet be pregnant. Best of luck for this cycle, I know how hard it is to go cycle after cycle without any luck.