I've been ttc since October and for the past 4 weeks have had nausea, heartburn, motion sickness, headaches, smell sensitivity, and a huge appetite. I'm thinking my last period (4 days and light rather than the regular 6) could possibly have been implantation bleeding. I've been to the Dr to get my blood levels checked in case it had to do with low sugars. So far all those tests are fine and all pregnancy tests have been negative. Has anyone else felt this way and still gotten negatives? The Dr did say it's possible to feel sick as early as a few days after conception.