Most ftm do not feel movement until 20+ weeks.
I'm 12weeks and 1 day today and I have a heartbeat monitor and I only use it once in a while not all the time
I bought a fetal doppler for 20 pound. with that I can listen to the baby's heart beat at home.
but my doc said they dont encourage using that device because some moms unnecessarily get very worried if they cant detect any heart beat. it takes time and patience to find it and often only works best after like 20 weeks. I'm only 12 weeks now.
Youre fine youre only 15 weeks