hello welcome to health care magic
very sorry to hear about the great loss your family has undergone.yes stress
can play a role in the hormonal
levels in your body. however the problem with stress is usually that women are not able to conceive because it causes anovulation
(no ovulation, due to hormonal imbalance). so now that you are over due by two weeks most like it must be due to the hormonal leves being inappropriate, you are not likely to be pregnant. however you shoulg get a blood pregnancy
test, serum beta hcg
to be sure.if it is negative then you can consult your gynaecologist and take a withdrawal medicine so you get your period.