A Toolkit for Federal Agencies on Implementing Executive Order 13548. Receive an overview of federal disability hiring practices from the U.S. Office of Personnel Management. Learn the basics of the Schedule A hiring process. A Schedule A Letter is proof of disability and certification of job readiness.
1 This ultrasound can routinely detect a heartbeat in your baby as early as 6-7 weeks. 2  Confirming the correct dates of your pregnancy. 3  Some women are uncertain of their last menstrual period (LMP) or have irregular menstrual cycles, making it difficult for their doctor to correctly estimate when the baby is due.
If ultrasound is performed in the first trimester, it can indicate fetal age within a range of 3 5 days. Later in pregnancy, it is less accurate. Up to 20 weeks, the margin of error is 7 10 days. By the third trimester, an ultrasound date can be off by as much as 3 weeks in either direction.