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!onfidence votes 648. The baby's heart beat can be seen on an ultrasound at around 7 weeks, and if you are very slim MAY be heard on a Doppler from 9 or 10 weeks. Here is more advice and input: * Most Heartbeats can be heard by 15/16 weeks.