Feeling hopeless

Melody • Pregnant with #2☺️
I see the posts on here and everyone seems have it under control and are able to cheat sometimes.
Then there is me....I am following the diet exactly but it doesn't seem to matter.  My numbers are all over the place....some are good, but just as mang are bad.  
And it's only been two weeks.....I feel like I am failing my future child...and my husband because I cannot stay healthy for our baby....
Ahhh!! Melt down day!!