17 weeks now

I had a boy at 21 weeks but his heart stopped beating around 16-17 weeks. We didnt find out until 21 weeks. It was a missed miscarriage and I was induced labor. This happened in October and I'm currently pregnant with baby #2 at 17 weeks. I feel like I've felt her move but I haven't in a couple days and I'm so worried something bad happened to her. It's just the same time as her big brother passed. My doctors appointment is in 8 days and I just cant wait that long I need to know now, and I'm really terrified to look at the screen. I dont wanna look for a heartbeat and then have it not be there. I need some advice what I can do