will social services get involved if I go to the doctors for help with depression?

I love my kids, they're the only things that keep me alive. I have 5 kids and pregnant with number 6 but lately all I want to do is hurt myself, sleep and cry. I've never hurt my kids but I'm so short tempered with them. My oh is not around much at the moment. I'm worried that I'm doing harm to my son in my belly by always being down, depressed, sad, angry, crying and I just want him to be ok. I know antidepressants are not great in pregnancy but I really need some help! I'm in control right now but I don't want to leave it until I lose control and it affects my children. I've been feeling like this for a while but I'm so scared that they might think I'm an unfit mother and call social services on me. It's crazy because I'm studying to be a social worker and I know ultimately they don't want to take away your kids but to give you some support to get through your situation but I don't feel like I know enough about it yet to fully trust social services as I'm only in my first year. That's the reason why I've suffered through on my own so long. Does anyone know if I can get help without them getting involved? Please help.