7.5 Weeks Pregnant: Heart Rate & Embryo Size - What to Expect

Normal heart rate:

The normal heart rate for a 7 ½ week embryo is between 120 and 160 beats per minute (bpm).

Embryo size:

At 7 ½ weeks, the embryo is about 18 millimeters (mm) in length or about the size of a blueberry.