Welcome back to icliniq.com.
The period of gestation is calculated from the day of last menstrual period. It is important to learn whether there was a fetal pole arrival by now inside the gestational sac or not. Ideally, if the fetal pole arrives, then the CRL measurement (crown lump length) is being taken ultrasonologically to estimate the gestation, else the gestational sac is being used under Hadlock formula. If in spite of the fetal pole, there has been no arrival of fetal heartbeat or there has been no arrival of even fetal pole by 9 weeks, then it would not arrive and it would be termed as failed pregnancy. It would be the best to opt for a dilation and curettage in that case. This is purely natural decision and has no bearing on future conceptions at all. The cause is usually idiopathic and one cannot be really sure in such early gestation when it has been the first pregnancy.