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.
I personally heard my baby's heart beat the first time at 14 weeks with my first, 13 weeks with my second and 10 weeks pregnant with my current pregnancy. * You can start to hear the babies heartbeat through ultrasound as soon as 6 weeks into your pregnancy! A Doppler can start to pick up a heartbeat at around 10-14 weeks into your pregnancy. A stethoscope can be used to hear the baby's heartbeat late in the pregnancy. * If you have an early scan it can be seen from about 6 weeks. If listening with a Doppler and you are very slim sometimes (not always) it can be heard from about 8 weeks.