they need a second blood test to determine pregnancy? help!

Hello all. So I went in for a blood pregnancy test on Saturday because they said a urine test came back faint positive. I called them today and they said they need another blood test to compare the numbers. I'm not sure what this means they didn't say if it was positive or negative..what could this mean?? They didn't wanna explain anything to me and I'm not sure what to think. I am going to call my primary doctor today and have him tell me because I'm starting to worry. I took 4 home pregnancy tests. Two the day after the clinic urine test and two the next day with my morning urine and all came back negative. I'm so confused