Anyone ever experienced depression or anxiety during pregnancy?

I have been diagnosed officially today and prescribed 50mg of sertraline to help me feel more positive and attached to my baby. I want the best for him, and I was way too aware that my stress and anxiety levels were affecting my son; I was constantly vomiting in stressful situations. It is difficult though. If i mention how I am struggling to anyone, they just tell me to get over it! My GP gave me meds today and we have a review in a couple of weeks. Has anyone ever had any prenatal mental health issues as opposed to post natal?