A little science lesson.
Women generally ovulate 14 day BEFORE their next period. If you had unprotected sex 1 1/2 weeks ago, you are very likely not pregnant.
It takes approximately 6 days for a fertilized egg to attach itself to the uterin wall. Your body would only then get an idea it was pregnant.
IF you have enough pregnancy hormones in your body to give you PREGNANCY SYMPTOMS, then you have enough pregnancy hormones in your body to trigger a POSITIVE pregnancy test.
Simple answer here is, you are not pregnant. What you are experiencing is not pregnancy symptoms but pms symptoms.
But please, take a test when your period is due.