Whether she does now or not, at most it is a VERY early pregnancy:
http://www.health-science-report.com/miscarriage/miscarriage-cause/miscarriage-percentage.html
"Miscarriage Percentage
Actual miscarriage percentage among women is high; risk reduction and early care of HPV dysplasia found in a Pap smear and other STDs improves chances.
According to statistics, about a
half of all fertilized eggs end up miscarried before a woman even knows about the pregnancy. Hence, a natural loss is common and many women (about 87%) who have experienced one fetal loss are likely to deliver a baby successfully in the future. Actual miscarriage percentage among women is high; risk reduction and early care of HPV dysplasia found in a Pap smear and other STDs improves chances."
One week, even if test-able, is earlier than most women would traditionally have been aware they are pregnant. It is now realized, medically, that far more women have lost pregnancies in the earliest weeks (and never been aware of it), before they missed a period, than was previously thought. Until and unless there actually IS a baby, he can do (and probably should do) NOTHING.