final impression of my ultrasound last july 5 is twin pregnanacy, both live, both female, probably monochorionic diamniotic type. twin a: 33 wks 3 days aog by fetal biometry; efw=2145+/-322 g(4 lb 12 oz). good cardiac activity(fhb=134 bpm), active fetal breathing & somatic movements. adequate amniotic fluid volume (svp=5.1 cm); edd august 20 2012. twin b: 31 wks 6 days aog by fetal biometry;efw=1783+/-268 g( 3 lb 15 oz) good cardiac activity (fhb=138 bpm); active fetal breathing & somatic movements. adequate amniotic fluid volume (svp = 3.92 cm), edd august 31, 2012 single placenta left fundal, grade II, no previa note of thin separating membrane (2.5 mm) note: no fetal growth discordancy (17% weight difference). do i have to worry about the result?