Suddenly feeling blue😔 third trimester

I was feeling pretty balanced in my second trimester after coping with some anxiety in my 1st trimester. Suddenly, in the past few days, I’ve started feeling sad. Just down and blue. Not bawling or unable to get out of bed...just sad. Has anyone else experienced this going into the third trimester? Could it just be hormones? I haven’t experienced anything out of the ordinary and the normal “pregnancy stressors and changes”

Just wondering if I’m not alone. Thanks ladies!