hear the heartbeat ?

So around 12 weeks, i went in to hear the heartbeat and the doctor couldn’t find it and said it could be too early. went for an ultrasound that same day and baby was great with heart rate of 161!

I go in again at 15 + 4 days in January and I was wondering if they’d be able to hear the heartbeat by then? It freaks me out so much when they can’t find it!

I don’t know if I have an anterior placenta or something. Here’s the ultrasound: