Hi,
Thanks for query,
If you are not involved in a vaginal sex than there is no chance of
pregnancy.
Your home pregnancy test also shows negative result.
You have delayed period due to
hormonal imbalance.
Hormonal imbalance may be due to tension,
anxiety,Late working hours ,shift duty or any
ovarian disease.
So wait for your period.
Stomach pain & tooth extraction has no relation to your cycle.
Thanks.