Good evening girls I'm 21 weeks pregnant My back is bothering me…

Good evening girls I'm 21 weeks pregnant My back is bothering me especially in the middle Even when I lie down and sit The baby isn't big on ultrasound it was two weeks ago Who has this too? How do you cope? And one more question What should I do about mood swings? I love my husband so much these days and he's very handsome Before he used to bother me and was terribly ugly and then...it repeats itself