@BabyB19 I’m sorry for your loss, and I understand that this is anxious time for you.
Unfortunately I very much doubt that what you’re hearing is the baby’s heart rate if you are less than 12+1 weeks pregnant, as the baby is too small to be able to detect its heart rate from your abdomen from before then.
It’s actually really difficult to detect the heart rate before 16 weeks, and even then it can can take a while for your MV/Dr to locate it.
What you’re probably hearing is (if you’re in the early stages) is the baby’s placenta, or it can also be your own heart rate which can often be doubled up even when heard through a Doppler by a trained MW/DR.
I appreciate these apps are designed to be a bit of fun, but personally I feel they are likely to cause more anxiety as you simply can’t be sure what it is your hearing.
I don’t think that anyone was trying to be unkind, they were trying to let you know that no app will be able to effectively detect a baby’s heart rate the best way to know that your baby is well is when they start to kick, but I appreciate this will be a few weeks yet if you are in the early stages.