Pregnancy

What Week Is Best to Try Listening to a Heartbeat by Phone?

There is no single week when a phone is guaranteed to capture the rhythm you hope to hear. A microphone-based app does not work like ultrasound or a clinical Doppler, and the result depends on many physical and technical factors. For Bubbi, mid-pregnancy is a practical guide, not a medical milestone or guarantee.

Expectant mother viewing a pregnancy calendar on her phone

Written by HelloMommyHelloMommy editorial teamUpdated September 3, 20262 min read

Why early cardiac activity on ultrasound is different

During an early ultrasound, a trained professional may detect embryonic cardiac activity with specialist equipment. A phone microphone does not create an ultrasound image and does not have the same sensitivity, so seeing cardiac activity on an early scan does not mean the same sound can be recorded at home.

Bubbi’s practical guide: around 18–22 weeks

According to Bubbi, many parents begin trying at around 18–22 weeks. Some capture a recording earlier or later. This range reflects app-use experience; it is not the point when you should begin monitoring a heartbeat.

What affects the result besides the week

Your baby’s position can change even within one day. Placenta location, body characteristics, movement, the phone case, microphone design and room noise can also affect the recording. That is why two sessions in the same week may sound different.

How to try without added pressure

Choose a quiet time, do one short session and stop if it does not work. Do not set yourself a required target or compare your recordings with other people’s videos. A sound captured at home can become a memory, but it is not a developmental checkpoint.

When you need a clinician, not an app

Routine tests should follow the schedule set by your healthcare professional. If you have bleeding, pain, leaking fluid, feel unwell or notice a change in your baby’s usual movements, seek medical care regardless of what you can hear on your phone.

Frequently asked questions

Should I try Bubbi before 18 weeks?

You can explore the app, but early attempts often do not produce a clear recording. Hearing nothing does not indicate anything about your baby’s condition.

Why could I hear a sound yesterday but not today?

Your baby’s position, the phone and background noise can change. This is not a medical indicator.

When is the standard second-trimester ultrasound?

ACOG notes that the standard exam is often performed at 18–22 weeks, but your clinician determines your individual schedule.

Sources

This article is for general information only and is not medical advice. Always talk to your doctor or midwife about your own pregnancy.