I feel bad for you since you are obviously stressing.
There is always a chance you can get pregnant when you have unprotected sex. Generally, you ovulate on the 14-17th days of your menstral cycle. So if your last period was on the 16th you would then ovulate on or about the 30th of April through the 3rd of May. So actually there is a good chance you could be pregnant. Try not to stress yourself out because stress can also lead to a delayed period when your not pregnant. YOU NEED A PREGNANCY TEST ASAP.
