Joanne,
Take care and all the best. Is your menses regular? If not, it is possible that you are earlier in your pregnancy than expected and that may be the source of the problems. Anyway, hope everything turns out well during the next scan. Due to my irregular menses, my #1 was smaller than expected during the first scan (the worry was she was not growing). After 2nd scan, my EDD was adjusted to reflect the "age" of te BB acording to the scan rather than my LMP. This time, again due to irregular menses, heartbeat cannot be seen yet. I'm waiting 3 weeks for another scan. Stay positive ok.
Sunflowerseed,
Yah mine also comes and go. Nausea, backaches, headaches, abdominal pain... my gynae just said "So early ah. Ok I give you some vitamins that can help reduce the nausea." So I guess its not uncommon. During my #1, I had a bad flu during this period so I was suffering from the flu effects more than any MS. Thankfully, my MS for my #1 were just some days. Other days it was ok. This #2 seems much more jialat at the moment.