Question: What does a u/5 on a blood pregnancy test mean

So I think I'm pregnant. I went to the dr on 7/6 an had a blood test done. Iv had them a few months ago n when I looked at my paper it always said Hcg 0 then on 7/6 it shows Hcg u/5 what does this mean I feel pregnant got all the symptoms always hungry tired all the time sore boobs. Headaches cramps back aches plus had a 2hour spotting. Could I just not be far along an the beta hcg test shows somewhat hormones in my blood because they always put the hcg0 please help I'm wanting another so bad right now it's not even funny. Thanks ladies