Looking - that's brilliant news!! So happy for you. I think you need to just take a deep breath and let the adrenaline wear off. It's fantastic that you have seen the heartbeat. Maybe try and find some comfort in that, rather than switching to something new to worry about! I have a friend who is nearly six months along now - perfectly healthy pregnancy - and she had no nausea at all.
Parsnip - I love you, but you seriously need to stop with the near constant cb testing. All you are doing is making yourself miserable and stressed out. There is no point to it. Why are you doing it to yourself? cb's are only pregnancy tests - I think many people have reiterated this now in the last two threads, but they aren't supposed to be used as hcg measures. I KNOW how stressful and worrying it is, but if something bad is going to happen, then it's going to happen, no matter how many tests you take. At this rate you are going to spend your entire pregnancy in a state of near constant panic. The first trimester, then potential problems with the baby, then something else, then something else....
So I say this with nothing but kindness, but STOP STRESSING ABOUT EVERY SINGLE BLOODY THING AND CHILL. 