The first meaning is 'metre' which is a measurement of length. If the 'm' stands alone it is metre. The second meaning is 'milliâ¦' which means a thousandth. In this case 'm' can not stand alone, we need to know what we have a thousandth of; if it is weight, length or some other thing. Example: mg means 'milligram', a thousandth of a gram. Example: mm means 'millimetre', a thousanth of a meter.
At about six weeks into pregnancy (four weeks from conception), you should be able to see your baby's heartbeat on ultrasound. The typical heart rate at this age is about 100 beats per minute.
Your babyâs heart begins to form approximately three weeks after conception. Starting from the fourth week, your babyâs heartbeat can be detected transvaginally. Starting from 12 th week your doctor can detect a babyâs heart beating via a Doppler device, although many doctors wait longer to use a Doppler, as itâs quite difficult to find a heartbeat at such an early gestation.