I totally get this, because you've been through the nausea and discomfort as your reassurance, and now that it's settling down your mind is playing tricks on you. But honestly, the fact that you've already had your scans and heard the heartbeat is the real reassurance, not the symptoms, and that's actually a good sign for how the pregnancy is progressing. Symptoms do come and go in the first trimester, and some women feel less as they move through it, so what you're experiencing is quite normal. If the anxiety keeps creeping in though, might be worth having a chat with your gynae or even the polyclinic about it, because they can give you that extra peace of mind and maybe even arrange a quick scan if you need one. You've done all the right things so far, so try to trust that.