Tiptops don't let scare mongering prevent you from being honest with MH services; being honest is the only way you can get the support you need to recover.
As I said last time I posted, I had SS involved because I had been in a psych hospital within the year previous to becoming pregnant. They were lovely, supportive, and disappeared very quickly after DS was born because they had no concerns.
Since then I have continued to see my mental health team fortnightly / weekly depending on my mental state, have at times seen my psych every two weeks too, have attended day hospital services, done two intensive therapy courses, and have had the crisis team involved a few times; they're currently visiting me nightly. At no time during all of this has social services been mentioned. I asked my psych once about it, and he reassured me considerably. And I also spoke to the social worker about it, who told me that they work to keep families together wherever possible.
Social services get bad press; they're damned if they do, damned if they don't. You don't hear about all the families and individuals they help on a daily basis, you just hear the horror stories - because we've become addicted to wanting to know the drastic situations and how everyone is out to get us. That's not how society works, and it's certainly not how social services function.
So please... Continue to be honest with mental health workers. In the long run, it will be better for you, and for any children you have, if you are progressing with recovery, and the only way to do that is to work with services as fully as possible.