So what are the symptoms of depression in pregnancy?

Same as depression: It really doesn't differ from depression in non pregnant patients. A depressed or sad mood, anhedonia (a lack of getting pleasure out of things that normally should please you), lack of sex drive, a flattened affect (meaning speach that lacks expression), and if severe thought of harming yourself or the baby.

Same as non-pregnant: Symptom of depression in pregnancy are the same as depression in non-pregnant individuals, namely, depressed mood, poor concentration, loss of interest in usually pleasurable activities, social withdrawal, guilt, low energy, sleep or appetite changes, suicidal ideation, and decreased sex drive.

Seek help: If you are feeling 'the blues' or depression, there are treatments for this and not all are medicinal. 'solo time', that is time for you to do what makes you you is very important and can, by itself, often help the problem immensely. Certainly family support systems, counselors and medical intervention are also available and important resources. Do not just try to 'tough it out'.

Balance hormones: I find that hormone imbalance usually causes depression around pregnancy. The pregnancy can also start a thyroid problem too. These should be treated by balancing the hormones or treating the thyroid rather than prescribing antidepressants.

Talk to Someone: Be sure to talk with your physician or other provider about your mood. It may be helpful for you to seek out therapy or counseling. You also want to try to have a good support system in place. Medications are sometimes considered for depression during pregnancy, but usually only in more severe cases.