Low Progesterone

Hi all! I took a hpt and got a BFP last week 2 days after what I thought was a 2 day long period! I had spotting all week after that and when I went to my OB she have me a blood test that they then repeated 2 days later. My HCG was normal and rising, but my progesterone was very low, less than 1. All the spotting and bleeding have stopped and I am having a lot of normal preggo symptoms. They started me in Progesterone yesterday... I am feeling so confused and uncertain about what the future of this pregnancy will be! Anyone else out there experienced anything like this???