I have to agree with Chloe9 I’m afraid.
I really want this to all work out for you, but it’s just not going to.
You lost you other child 5 months ago, then started a relationship with a convicted murderer, and are now pregnant.
I don’t think SS will see this as being very stable, in fact I think it will raise a lot of concerns, especially if you are believing from your partner he is innocent.
They will question your life choices, your priorities, and also your disbelief in the system and law.
If you really want to keep your baby you MUST leave him. You must put your baby first. Your baby must be your number one priority.
There are mother/baby units out there that can help you keep your baby, but you have to be willing to do everything SS says, jump through hoops and tow the line.
I’m not saying they will take your baby, but they will be watching you, and if they think you’re putting your baby at risk then they will take action.
Also, 5 months is not long enough for you to even know your partner, not really. Nor is it long enough for you to be fine and have your life back on track.
Please listen to the other posters, your baby is your priority now, and you need to do all you can to keep him/her, and that does mean leaving your partner.