Hi and welcome.
I know what you mean, every lessening or change of symptoms I am worried that I am losing the baby. For example, my skin flared up last week, as expected as i reacted badly to the progesterone only injection, but this week I have clearer skin than I have ever had.... I have even found myself praying for them to come back. Silly I know, but I convinced myself it meant i was no longer pregnant, rather than I may be one of the lucky ones whose skin gets better during pregnancy (Bl**dy glass half empty!!!) I even did another PG test on Saturday to make sure I was still PG (it was positive). I keep talking to myself and telling myself to relax but its easier said than done.
The best thing I've found is this forum, it's great to know that there are people feeling exactly the same way as you.