Thanks for using health care magic for posting your query.
I have gone through your given history in detail.
In your description you have mentioned that you had used condom during both the encounters and he had pulled out. It is very very unlikely that you could be pregnant. Theorotically yes it is possible but the chances are very rare. With two negative blood tests you can be assured.
can delay the periods and you should consider doing Yoga
to reduce your stress. Think of going for a weekend holiday.
If you still dont get your period do consult your gynecologist who may like to examine you once.
Hope I am able to answer your concerns.
If you have any further query, I would be glad to help you.
In future if you wish to contact me directly, you can use the below mentioned link:
Wish you good health,
Dr. Srikanth Reddy M.D.