Understanding Post-Coital Bleeding & Pregnancy: Blood Test Results

Question
I am 34 years old.  I had my last normal period on Feb 15.  I had an incident of condom faliure on March 4.  I took the morning after pill on March 6.  I had bleeding starting on March 15 it lasted 4 days brown to bright red to brown.  I guess this was my period?  I am very very bloated and my breast are sore.  I took a few HPT's and they all came back negative.  I went to the doctor on march 29 and took a blood test.  Which also came back negative.  I can not shake this feeling.  Am I crazy or could I be pregnant?  

Answer
If your last period started on February 15, you would have ovulated on February 28, and could only have become pregnant if you had sex on February 27,28,March 1, or 2. It is unlikely that you would have conceived if you had sex on March 4. However, you did the right thing by takiing the morning after pill. After a morning after pill, you will usually start bleeding within a few weeks. If you took HPTs after March 22, and they were negative, you are not pregnant. If you took a blood test for pregnancy, and it was negative, you are not pregnant.