As you had unprotected sex around the time of ovulation, there is a possibility of pregnancy
These symptoms may be due to pregnancy.
The spotting may be due to implantation
But all these do not confirm pregnancy.
For confirmation, you need to do Urine pregnancy test done.
The test you took on 12 th, may be too early to come positive, so, I would suggest you to repeat the test.
If still negative and no periods, please consult the doctor. You will need to have detail examination and get blood test
and USG to find out the cause.
Hope this information is helpful.
Dr. Mrs. Sumeet Baheti