It might be the way she’s currently laying. I’m 35 weeks and my little one had her back to us the last time I went for an appointment so we struggled to find s clear heartbeat and when we did it was faint. If you’re worried just contact your midwife and try and arrange another appointment but you should be okay. They may be hiding from you🤍
Very normal when then early, lots of places won't try and find it that early
Baby might just be hiding I wouldn’t worry too much x