The experience of the coder. The complexity and size of the app. How bulletproof the app has to be, e.g. something to be run by a hundred tolerant people vs generally released to the public. The country the coder is living in.
A: On transvaginal ultrasound, you can usually see the heartbeat by about four weeks after conception. In obstetrics, we traditionally count weeks from the last period. For a woman with 28-day cycles, a month pregnant is about two weeks after conception, and you would not expect to see a heartbeat. But by a month after conception, youâd be right around the time a heartbeat is expected.
But typically... With modern Doppler devices, a fetal heartbeat can be heard from 10-12 weeks, although not hearing them up to 12 weeks is not particularly worrisome. With only a stethoscope you'd have to wait until about 18-20 weeks. A common mistake is to hear the radiated blasts of the maternal heart rate in this area.