Depression

Recently my life have been spiraling out of control its like I can't get a break from things going wrong my boyfriend and I had got back together earlier this year after a four month break and nothing was going right we argue all the time and nothing was going they way it should so we decided to go out separate ways. In the mist of this I got depressed really bad and now i feel like I'm useless and I'm going to fail at everything not to mention we already have a two years old daughter so every day I push myself to do things but I still feel like crap and that I'm not good enough for anyone or myself. So how do I get over this? I'm already on medicine but I still feel down sometimes. I'm still pregnant