The original definitions of sepsis and related conditions (SIRS, severe sepsis and septic shock) are now more than 20 years old (Sepsis- 1 originated from the ACCP/SCCM consensus meeting in 1991 and Sepsis 2 from 2001)
Lifting something heavy. This caution is really for women who can cause a placental tear in the second or third trimester. This does not necessarily mean a miscarriage, and usually if you feel terrible pains later, it just means that you strained one of the round ligaments holding your uterus in place. A little rest will be all that is needed.
Whether you should be lifting during pregnancy or not is a question for your healthcare provider, but the general rule of thumb is let someone else do it for you. Women who are at risk for premature labor may need to stop lifting objects after the first trimester. This is something to discuss with your doctor.