Advice!!

So I tested the day my period was supposed to come and got a very strong postive. Well that same day I went to the clinic due to very light spotting and when I was tested there, the doctor told me the line was faint and it would more then likley be a chemical pregnancy and to test a few days later. I went home pretty discouraged I had light cramping on and off but no more spotting. So a couple days later I tested agian and the positive line was darker then the control line.. so if I got strong positives with home pregnancy tests why did the test at the clinic turn up faint? Anyone else experience this? Trying to hold on to hope that everything will be ok.