Am I preggers or not!?

Hello Everyone! I am way overdue for my period, i took THREE hpt's and all three said PREGNANT!!! I went and got blood work drawn and my DR said to go see an OBGYN because the blood work shows positive for being pregnant! Now i call my OBGYN and the nurse i spoke to said that they need Quantitative Blood Work not the Qualitative Blood Work which is what my primary care dr ordered. She then proceeded to say that many things could have caused positive hpts and blood work besides pregnancy. So now i am freaking out because i was excited that i finally was pregnant but now im worried that it could be something else since that is what the nurse said. So am i pregnant or is it something else that i should be worried about!!! HELP!!!!