Oh Hooley Dooley MrsS, I had things like that happen with the last pregnancy. With this one, I have not thrown up, but I have certainly had lots of moments where I have been bursting to eat something in particular, and then I take a bite, and I can't eat it. I kinda start chewing a million times, before I can even swallow it. And I refuse to give up Bacon, but it would not let me eat the Bacon the other weekend. I don't think it is too early to be having symptoms, infact any symptoms I had were before I missed my AF, and all I have had since then is tiredness. I have had the dating scan and the 12 week scan and Bubs is perfect, so goes to show you hey? I sure hope this is it for you, and 7DPO is perfect for Implantation. My hot tip is wear white knickers from Ovulation onwards that way you can see implantation spotting if you get any lol, I bought a pk of 12 or something from Target so I could spot Implantation, and I saw it at 6DPO lol. Good Luck, I'll stalk you x