Sever Depression & Suicidal Ideation

I am almost out of my first trimester but I have had reoccurring thoughts of suicide that haunt me.
I'm suffered from depression and currently take medication but sometimes it feels like I'm starting from scratch... Like I've never worked towards recovery or like the antidepressants aren't helping.
When I look into the future, I can see myself and my partner as loving parents to a beautiful child but I am struggling nonetheless.  
I feel like a bad person for having such dark thoughts during a really social time in my life.  Has anyone else experienced something similar? I would really appreciate any advice or support.