lynn - ling is right, best to get a scan just to check this out, no point speculating and worrying yourself like this. you're right that in some cases, where the pregnancy is not viable, you can have a missed m/c where the fetus has stopped growing but yet you don't bleed - but you won't know unless you get scanned. chances are your period is just late for some other reason. take care and keep us updated on how you are getting on.
ling - thankfully no fever, so I did not need meds really. I just had a very sore throat and some nasal congestion. Not too major to warrant medication though I probably would have been more comfortable (physically) taking some. The GP I saw said that no meds are strictly speaking safe in the first trimester, but of course, he prescribed stuff that's generally considered ok. Guess it's just a question of balancing out risks and benefit - for me, because my sore throat/cold wasn't too severe, could still tahan without meds. Good luck for your scan tmrrow!