struggling with depression & connecting to my baby.

My dr started me out on lexapro back in January for anxiety and depression that seemed to work really well for me. 

I found out I was pregnant in march and although I have been told it safe to take I just feel terrible about taking medicine while pregnant even if it's safe. I don't know why I feel irrational like this but I do. 

My depression and anxiety is back at a all time high. I haven't been able to be happy about being pregnant. I haven't taken any pictures. I haven't been able to be happy with my partner. I sleep all day and I gave up my job because I couldn't handle anything.  My partner has stopped me from self harming like I used to. I'm happy to be pregnant it's just like I see a cloud of nothing. 

I'm 20weeks pregnant. I don't connect with my baby. I don't talk to him. I feel him kick sometimes and it doesn't provoke any feeling out of me. I know I love him I'm just struggling so much and I feel so ashamed.

Do I talk to my dr who prescribe me my medicine or do I tell my obgyn? I just want to be happy. I have changed my diet and I workout. I have cleaned out a lot of junk to help my mind but nothing is working so I'm feeling like medicine might be my only option. 

Any help would be appreciated.