Sorry but ultrasound is more accurate than dates according to your last menstrual period. Due dates obtained by a first trimester ultrasound are very accurate within about 4 days. While due dates obtained by your last period are not accurate for a lot of women. For example, I have 5 or 6 week cycles, so I ovulate (and conceive) at week 3 or 4 in my cycle instead of week 2 like those women with 4 week textbook cycles. So my due date of May 1 takes that into account (and came from my 9 week ultrasound). If I were to go by my last menstrual period, I would supposedly be due a week earlier. Now if you were charting your basal body temperature, that would be pretty accurate too. Fundal height measurements aren't that accurate either. My sister knew exactly when she ovulated but her belly measured 5 cm (5 weeks) ahead. Yet her baby was born exactly on the 40 week due date according to her conception date and my niece weighed 8 pounds. Her cycles are 6 weeks long, so by LMP, she was 42 weeks, but she knew that by conception, she was only 40 weeks (and her first trimester ultrasound due date matched her conception date and 40 week delivery date). My OB said that the hospital won't even let her induce a patient before 39 weeks. I know it's hard to wait, but I promise that these last weeks of pregnancy really will end, and sooner than you think. Each time I am pregnant, I get soooooo antsy and just want the last ten weeks to be over. But then the baby comes and the sleep and "me time" ends and I always wish I had enjoyed the pre-birth time more fully. I tell myself now to appreciate the full nights of sleep while I still can. I induced my first baby mostly because I was impatient. Honestly, my second and third births that started spontaneously were more magical experiences because they happened on their own. And you won't be pregnant for ten months just because the midwife gives you a particular due date or refuses to induce you at a certain time because of it. If you are actually correct and are really 32 weeks instead of 30, then your labor will probably start on its own much sooner than "42 weeks."