Signs CPS is watching your home?

I didn’t know where to post this. My husband and I went through a domestic violence 6 months ago and ever since then I’ve been working with CPS. The case is against him, and I’m not a respondent, but because I have the kids in my home a worker sees them once a month in home. My husband is ordered out of home, and can have supervised visits with a family member. I feel like CPS is watching my house though. Yesterday there was a white Lincoln sitting a house down from mine, on, facing towards my house. I let my dog inside and had to get ready to bring my kids to the doctor. The car was still there. Headlights on and that. I couldn’t see inside to see if someone was there. I got my son in the car, and always load my kids one by one, leave my front door open. I grabbed my daughter and then got her in the car. As soon as I go to get into the car the car turns around and quickly speeds away. I wasn’t able to see who was in it. What are signs CPS is watching you? And why?