Measuring progesterone level alone can not completely rule out ectopic pregnancy, it is recommended to do blood HCG measurement and ultrasound at the same time.
Ectopic pregnancy refers to the fertilized egg in the uterus body cavity outside the bed development, in the ectopic pregnancy, progesterone level is generally lower, so progesterone measurement can assist in the diagnosis of whether there is ectopic pregnancy. Theoretically, progesterone level greater than 25ng/ml can basically exclude ectopic pregnancy, so progesterone 28ng/ml can also basically exclude ectopic pregnancy.
However, it should be noted that the value of progesterone can only assist in the diagnosis of ectopic pregnancy, so in addition to checking the progesterone, blood HCG measurement and ultrasound and other tests should be done to determine whether there is an ectopic pregnancy. In addition, during pregnancy, if there is any discomfort, you should seek medical attention.