Paranoid? Or should I worry?

Lindsay
I has 2 early mc last year, one at 5 weeks one at 6 weeks. I found out I was pregnant again a few weeks ago. I was getting strong positive lines (didn't have these last time) sore boobs, feeling a little nauseous etc. I am now 7 weeks and 2 days and for the last week my pink positive lines haven't been as dark as they were the week before. They are still good lines, but not as dark as they have been. My symptoms are here one day and nothing the next, then back then gone etc. I have had no bleeding (has bleeding early with both mc last year). I am worried my hcg levels are dropping and will have a mc or mmc. My appointment isn't until 28 April and I can't get in before that.
Do you think I am being paranoid or should I worry?