There is no need for worry.
The first week of menstrual cycle is safe period. Even if you have unprotected sex during this time it does not result in pregnancy
. And after that you did not have sex at all. Am I right? SO THERE IS NO CHANCE OF YOU BEING PREGNANT.
There are several reasons for your period being delayed.
Occasionally a period can be delayed and this is normal. Physical stress
like excessive exercise and emotional stress can also delay period.
The symptoms you are feeling could be due to hormone progesterone
secreted in the second half of menstrual cycle.
Stop worrying and don't be stressed. You may start period in few days. If you don't get period by next week, consult your family physician and take progesterone to start your period.
I hope I have answered to your satisfaction. If you have any further concerns, do contact me through Healthcare Magic.