Worried!!!

Carly • I am 32 and from Southampton in UK. Me and my oh are TTC baby number one. Had miscarriage in January 2015.
Hi so I went to my docs a few weeks ago complaining of back ache and tiredness and painful periods since my miscarriage in January. They booked me in for blood test which o went for. Today they called me saying they wish to see me about my blood test. The receptionist said its routine. I have never had this before with any other blood test I have ever had. I am so worried about what they're going to say. Has anyone had this? Any ideas on what it could be.