Pregnancy depression.

Wendy🌻 • Mommy to 4 sweet babies. 2 beautiful girls and 2 handsome boys. Baby #5 is a GIRL and due in June!!
Is this normal? I am usually an extremely happy person and I'm very thankful to be pregnant! 
But I want it to be over. I keep catching myself saying 'June is so far away and I'm gonna be pregnant for so long' i always feel so horrible and I just want to have my baby. 
I'm to the point that I just lay in bed daily and want to sleep. Sleep until June. This is just so tough for me. 
Please don't say I'm ungrateful. Because I'm very  happy to be having another baby!! But I wish the baby were full term Already and I'm only 12 weeks. 
What did you do to make yourself feel
Better? Or what would you recommend I do.