something's not right

Brianna
I just feel "off". I haven't had many symptoms this pregnancy other than heartburn and fatigue and yesterday and today I've been feeling totally energetic and good to go. 
I still have heartburn but not as badly. I just feel like something's wrong besides the symptoms dying down a bit. 
I felt like this with my last pregnancy too around the same time frame and that ended in a missed miscarriage. I just want answers as to what's going on, whether good or bad so I know what to expect I guess. 
This is so hard to be patient and trust that everything's ok.