Possibly pregnant

[Samma1]

I would like to understand what the possibilities are my current symptoms possibly being pregnancy symptoms. I had unprotected sex 3 days b4 my period about 1.5 mnths ago. 2 weeks ago I had sudden intense nausea shortly followed by dizziness and fainting. My menstruation period started the same day and my vitals were fine. Besides abnormal pain, fatigue and nausea my period was normal. Since then Ive been having pelvic cramping, queasiness, intermittent bloatedness, short lived headaches, occasional fatigue. I had flatulence last week and have been less regular so I took laxatives which was followed by these symptoms being intensified for the following 2 days. I took a pregnancy test which had a -ve result but the symptoms are still bothering me. Could this possibly be pregnancy or something else. The doctor has not been able to diagnose me as the blood tests he took all had acceptable results.