An ultrasound can help estimate this if your last menstrual period is unknown.
Estimating a gestational age through an ultrasound is most effective during the first trimester of pregnancy.
A heartbeat may not be visible during an ultrasound if the examination is performed early in pregnancy.
This would be prior to the development of cardiac activity.
Blue Ridge Women’s Center can provide limited obstetrical ultrasound for these purposes—free of charge—if you have a positive pregnancy test at the Center and are 8 weeks pregnant.
If a full diagnostic ultrasound would be more appropriate for your situation, because you’re further along in your pregnancy or experiencing medical problems, our staff will be happy to refer you to an OB-GYN who can offer that instead.
An ultrasound may detect fetal demise or other signs that your pregnancy is not progressing normally.
If you experience any complications between your scheduled visits, call your doctor immediately.Whether or not it’s an ectopic pregnancy can be further determined by checking for a rise in the amount of the hormone beta-h CG in the blood.A doubling of the level of beta-h CG over a period of about 48 hours is considered normal and normally excludes the diagnosis of ectopic pregnancy.Typically, if the due date suggested by the CRL falls within about five days of menstrual dating, the due date established by the LMP is kept throughout pregnancy.If the due date suggested by the CRL falls outside this range, the due date from the ultrasound is usually kept.